Installed Fabspeed bypass combo
 

I installed the Fabspeed pre-muffler and muffler bypass last night and took her out for a spin today. I LOVE it!!! It sounds so agressively intimidating when I get on it and has this put you in a Zen state of mind when cruising at 3K rpm. It does sound a tad louder than the Fabspeed video/sound clip but I anticipated that as it's a given. There is a very noticable difference (quieter) than with the muffler bypass alone. I will play with the car for the summer like this and shop around for a freeflow muffler to tack on to smooth it out even more. Yes the backfire pop is awesome as well. It's just loud enough without grabbing the authorities attention. You could drive around all day keeping it under 4K RPM an no one would be offended but above that it screams like a Viper. The Fabspeed bypass combo is FAB-U-LOUShttp://forums.pelicanparts.com/uploa...1120969619.jpg
http://forums.pelicanparts.com/uploa...1120969640.jpg
http://forums.pelicanparts.com/uploa...1120969662.jpg http://forums.pelicanparts.com/uploa...1120969676.jpg
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Looks like nice quality, especially next to your PAINTED valve covers! ;)

How much does this setup cost?

Isn't the lever a bit long, with everything just dangling off the heat exchanger flange???

Also, does this roast your tire without a heat shield (a-la factory)? Check tire pressure left to right. (Start with equal pressures left and right, drive it straight and remeasure when returning from a 20 minute trip).

Cheers, George

George, yes the fit and quality is top notch. The combo with 3 copper gaskets was $335 but would have been $365 except I bought the muffler bypass for $25 from a Rennlist member. Also a universal 3 wire O2 sensor was $60 manuf by Denso.
The pre muffler is actually cooler than a stock cat and also thinner so farther away from the tires. Air = insulation and therefore the shield is not needed. Makes it a snap to do stuff on that side now without it.
thanks for the compliment on the looks and the valve covers. I'm gun shy to paint things anymore after the caliper episode, that was weird and frustrating. I thought brakes were so much stronger than a little paint, almost doesn't make sense. But the Fabspeed stuff is awesome although a tad louder than it would be hooked up to a performance muffler.

Thanks again,

Gordon

I'd still test the tire pressures. It's the radiation you are worried about. On the other hand, on 74 and earlier cars and the SSI, there is exhaust piping in the same spot too. I guess the cat gets extremely hot, compared to a through pipe.

I'd love to hear this setup, since I think it is a real easy install. My pal still thinks about what to do for exhaust.

George

I'll check them and if they are off I'll post the info. There have been a few discussions on the board regarding the heat shield and it seems to be the concensus to toss it, especially with the cat replaced. The bypass runs much cooler than the cat and as a matter of fact the car runs cooler as a whole.
If you want to hear the set-up go to this link at Fabspeedhttp://www.fabspeed.com/911sc.html
scroll down to the cat and muffler bypass video crank up the sound and whalla! Hope you have decent speakers on your computer.
Again I love the sound though I think most would feel it's a bit too aggressive. A simple freeflow muffler would tone it down 5/10 db and then it would have that classic sports car sound.

Thanks

Did you add a support for the cat at the tailpipe end? Over time, this will add undue stress on your heat exchangers if not supported.

Looks like an awesome set up!

That gives me an idea. Its probably been done before but I could take the cat bypass and cut off the straight pipe section and have a muffler welded on plus a tip and then take off the stock muffler. I'd have to put the cat and muffler back on every year for the day but I like loud and light. Thanks for the pics.

Steve, no not yet but I plan to soon. I'm figuring out the best location for the support. It most definitely would be a good idea to do and wouldn't hurt in any way.
Tom, whozawhat? You don't need to cut anything off the cat bypass (actually it's a classic euro type pre-muffler that's reffered to as a cat bypass) to hook up a muffler of your choice. The bypass is the exact same length as your stock cat and the tail section you see is the muffler bypass which attaches to the pre muffler. All it is is a tube that attaches to the pre muffler instead of your muffler. You could hook up your stock 911 muffler to the cat bypasss or any other muffler you choose. No cutting required! Or did I misunderstand your post?

I listened to the video. Sounds loud.......oh baby do I want one.....

It's a tad louder than the video as well. I drove her most of the day today and man am I digging it!

I have mine, waiting to be installed.. :(
the car is up on blocks, getting new shoes and socks..

damn, need more time in my life.

Gost you're right about the misunderstanding. My thought was to cut the cat bypass and weld a muffler to it along with a tail and take off the stock muffler but after seeing what your set up cost don't think my idea is worth the cost. It would probably be more by the time I got it chromed like yours or coated.

gost: Buddy thats exactly the setup I am running on my own car. Its awesome!!!!
My car failed its annual inspection test due to the exessive niose though. Also because my car is backdated the stock exhaust will not fit behind the light RS bumper.
I am going to have to get one of those supertrapps, (that you replied to in another post) but need to find availability in the UK.
Do they do a Supertrap that will fit exactly this muffler bypass? You wouldn't happen to know the part number or model number would you? ;)

Steve Wong suggested to me that this set up may cause the engine to lean out on the top end. Are you not worried about that?

Lastly do you have the part number to that universal O2 sensor? Did you get it from Pelican? Steve W has also suggested that I re-fit the O2 sensor as my cars O2 was dissconnected by a previous owner. (I wonder why people do that??)

Hey Killer, Sorry but I don't have any info on the supertrapp stuff. I will research it myself though to see if it's worthwhile. I'll post info if I find it soon. I would think there is one that will fit as the bypass is a standard flange pattern and the exact same sive lenghtwise as the stock cat.
My next step to put this all together is the Wong chip. I have not spoken to him yet but will this week. I did not know that it may lean the top end out but I'm not worried as I Imagine his chip would compensate for this or I will install a freeflow muffler as well. The car sounds so awesome that I'm thrilled at this point and want to enjoy it for a few day's before I tackle the next task.
The O2 sensor I installed was manufactured by Denso which was reccomended by a trusty parts shop. Something about how they're made with an aluminum oxide trap and porous teflon filter making them more sensitive and accurate. What do I know, I trust him, has never steered me wrong. It was $60 and the part # 234-3000 which I believe is the same # for the Walker sensor and perhaps for all the universal sensors for the 3.2L. I bought it at a parts chain called Roadside here in New York. If you can't find it at your local dealer then contact Denso directly for their rep in your area. The car does run better than it ever has, then again I did a complete service on her at the same time.
Good luck Killer

let us know what Steve has to say about it.

I rigged up an exhaust hanger for the tail end of the Fabspeed bypass tonight. Was easy once I figured out the smartest way. I bought a exhaust strap hanger and modified it to fit onto one of the flange bolts at the end of the bypass.http://forums.pelicanparts.com/uploa...1121138948.jpg
The total length of the support was exactly 5 1/2 inches which was perfect to relieve some of the weight of the assembly off the exchangers.
I drilled a 5/16 hole through the engine skirt pan about 4 1/2" to the left of where the heat duct penetrates the pan. This was the most straightforward location and lines up perfectly with the upper right most flange bolt on the rear of the bypass. The left bolt didn't line up with anything really or you would have to fab some sort of heavy guage angle bracket and I think it would look like doody!
http://forums.pelicanparts.com/uploa...1121139150.jpg
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I fabbed 2 small strips of 14 guage steel and drilled holes for the bolt in each and used them for reinforcement on the pan which isn't made of very thick guage. I don't know if I needed to do this but it was easy so why not have some added insurance. The bracket came out excellent and you cannot see any kind of support from the rear of the car unless you put your cheek to the ground. I love this set-up and I love the way the car sounds, can't say it enough. Hope this helps you guy's with this set up.
You Fabspeed guy's have something you could either offer your customers or just let them know how to go about supporting the rear of the bypass. It's solid as a rock. Total tab- $ 8

that looks great!

but I'm more of a zip tie guy.

Looks great! Maybe Fabspeed will offer a resonator pipe in lieu of the straight pipe later. That's what I'd like to see. That would grab the rest of us with the noise issue.

They should make Stainless Zip Ties then it would be a no brainer and as easy as Zip Zip Zip!

Perhaps they will although if it sounded really good then that would reduce the demand for their mufflers so they prolly wouldn't. But it would be nice.

isn't the euro-premuff basically a resonator itself? I don't remember or think that resonators have padding.. I think they just have air chambers.
a test pipe, and the bypass pipe.. now that would be loud.

Yes it is. I thought you were talking about them making a mini cherry bomb type of muffler instead of the straight pipe off the rear, I missunderstood. Something to just cut the edge a little more.

Awesome gost! :) Nice little bracket. I am gonna have to think about adding something similar this weekend.

I thought the super trapp was something you could have just added to the tail pipe mouth (or opening) of the Fabspeed bypass??

Guys when you have this bypass system fitted you will LIVE at 4000rpm and above!

Re: Installed Fabspeed bypass combo
 

Gost,

Nice work! As you know I just switched out the cat. for a pre-muffler. The exhaust note is more pronounced now but man that bypass must be loud!

Perhaps I'll put one on when my muffler rots out.

Did that O2 sensor shield come with the pre-muff? Just wondering as mine wasn't there when I did the work. The 'shield' part had fallen off.

Kato

Thanks Killer. One could also tack weld the reinforcing plates to the pan so they don't move, might be overkill, I just like welding metal. PM me if you have any questions when you do yours, I have dimensions and such that may save you some time. I am not familiar with the Supertrapp stuff at all. Your other post was talking about Flowmaster mufflers wasn't it? Are they the same company perhaps. I had a friend who had a Supertrapp on his enduro bike and it was awesome and adjustible by removing discs within the muffler. Great piece it was. If they make something to replace the Fabspeed muffler bypass based on that design and theory then I've got to see and hear it.
Kato...No the shield came off my original sensor. It's stainless and cleaned up like new with steel wool. Someone must sell it out there. The muffler bypass is not that loud to me, again I think it's Fab-U-lous.
Sound is each to his own.
I contacted Steve Wong about a chip and I know a few of you were interested in his comments. Here they are:
Thank you for your interest. The only chips I supply for the 84-86 Carrera
now are the 4k chips. If your DME is not already 4k enabled, it will
require you to perform the conversion by moving the jumper, or the car won't
start. The 4k software, as used by Porsche after 87, provides the car with
much superior throttle response that the cruder early 2k software is
incapable of. In addition, the sub 4k lag of the stock programming is
eliminated, power begins as early as 2000 rpm. The chip you'd require for
your setup, would be the chip for the sport muffler/premuffler setup,
designed to work with either the stock muffler or a sport muffler, as
additional fuel is provided if an owner does perform additional minor
exhaust/intake modifications. The chip should also work with the muffler
bypass you are using, however other than custom programming, I have not
specially programmed for a muffler bypass, as you are probably only the
second person who has inquired over the years about using such a setup -
must be very loud I'd imagine. Primarily the differences in the programming
of the sport muffler/premuffler chip is the remapping of additional fuel
expecially in the low/mid range part thottle region that without, can lead
to excessive exhaust popping and backfiring from lean mixtures of a freer
flowing exhaust. The top end fueling is also increased for the additional
flow from the exhaust mods. You are welcome to try the chip, and return it
if it doesn't work out for you for any reason. If you have any other
questions, or if I can be of further assistance, feel free to ask me.

Best regards,
Steve Wong

Nice offer, how can you go wrong. I am surprised no one has asked about a chip to accomodate a cat and muffler bypass combo especially for track use. I'll give him a buzz on the phone and chat a bit. If new news arises I will post it.

I was that other guy who asked about the chip.

Hmmn I think I need a Supertrapp.. I was hoping to get just the end piece to add to the end of the Fabspeed bypass exhaust tip. I wonder if that would be even possible??
I know they sell the end part (important part) of the Supertrapp but fitting it to the end of the slash cut fabspeed exhaust tip maybe a problem. Also I am not having any luck with suppliers of Supertrapp's here in the UK.

Killer check out your " 3.2 with no back box " post. I just posted some info.

I wold have bolted it to the body before I would use the engine tin. The engine tin is not very sturdy, since all it is there for is to funnel air. If anything sags, it may take the tin right with it?

George

The whole section moves with the torque twist of the engine george so there won't be much force on the tin at all. This is just to alleviate a very small amount of weight at the end of the cat and reduce the leverage which this did nicely. I also did add the reinforcing plates above and below the pan to spread any load that may be encountered and used large washers as well. It's rock solid and won't be under any unreasonable forces. There really is no other spot to do this and I don't want to put a muffler clamp on the end of tail pipe which would look like crap, I did a mock up of this and it did look like crap with the clamp in open view from behind. This is crisp and clean. It will be just fine, I'm positive of this but will let everyone know if it does show signs of strain. I will be adding a muffler in a few weeks so it won't be needed anyway unless I go back to this arrangement for fun sounds. It will be easy to do!
Thanks for your concern George.

Gordon

I thought I would post a few pics of the Flowmaster Series 80 # 52580 muffler I just installed. I painted it black after it was installed. To remove and install the muffler bypass takes 10 minutes. A beautiful thing.http://forums.pelicanparts.com/uploa...1121717680.jpg http://forums.pelicanparts.com/uploa...1121717693.jpg http://forums.pelicanparts.com/uploa...1121717734.jpg http://forums.pelicanparts.com/uploa...1121717765.jpg http://forums.pelicanparts.com/uploa...1121717787.jpg http://forums.pelicanparts.com/uploa...1121717826.jpg

Gost,
Let me know how you like your muffler.
I have installed a cat bypass by my mech was concerned about the muffler BP not creating enough backpressure to keep the valves cool, as you guys discussed here.
So for now the Muffler BP is still in the box in the garage.

Thanks for your information.

GLH

GLH, You will be fine using your muffler BP. It sounds just amazing. Your cat BP is like the Euro pre-muffler yes or is it just a straight thru pipe? Straight thru and it will sound like a tank, pre-muff it sounds sweet. You don't need backpressure on these engines contrary to other motors. Steve W of 911chips.com told me this. I just put his chip in as well. I put the muffler on to just tone down the note a tad as it is very aggressive with the muffler BP, I love it don't get me wrong but I now have options and it was cheap enough to throw on the muffler. The key is the ease with wich I can exchange components. Mine is set up so I can easily have any combination of stock cat and muffler and fabspeed stuff and flow master muffler...any combination, it's awesome and only takes about 15 minutes to swap everything out. The muffler sounds great, deep, throaty, aggressive and a great wail on WOT! I'm very very pleased!
Hope this helps and good luck

I don't know which but it looks exactlly like yours in your pictures on post one.
When I looked in it it looked wide open with small perforations along the interior wall of the pipe with some kind of insulation where the pipe is flaired out. Let me know which one you think I have. Fabspeed did call it the cat BP pipe.

I have been having slight muffled backfires since the install when shifting up from over 6000rpm to the next gear. Look pretty wild at night with a bleu flame coming out of the muffler.

The car is a 1984 Carrera currently running with the cat BP and a stock muffler. Picked up serious power just with the cat BP pipe but I am really apprentious of running lean and frying valves. I blew one of the engines on my boat last year running lean and it cost the price of the Porsche to re-built... So you can understand I am somewhat gun-shy.

Here's a pick of the car... and the boat for that matter...http://forums.pelicanparts.com/uploa...1122082642.jpg

Wow! That muffler must really improve low end pulling power.
http://forums.pelicanparts.com/uploa...1122084204.jpg

Nice boat BTW.

:D

Gost,
Checked and I do have the Euro-Premuffler Catbypass as far as I know.

GLH yup if it's from Fabspeed then it's the same one I have with the perforations in it. That bypass flows better than the stock cat but believe it or not it's actually quieter. I ran the muffler BP on both so I know. If you are concerned about runing lean what you can do is locate your DME under the drivers seat and on the rear end (facing the engine, make sure the seat is all the way forward) you will see this black round plug. In the center of that plug is an push through opening for a Y type shaped screw driver, or you can use the corect size flat blade, you have to do trials to get the right one. Behind this opening is a fuel delivery adjustment switch which is set from the factory to one side of the stop. You can adjust this switch I believe clockwise to 4 or five other settings that either richen or lean the fuel ratio. One click from stock is + 4% richer 2 clicks is 8% richer and they also advance timing by like 6 degrees. 3rd click I believe runs it 3% leaner and 4th yada yada. So you want to turn yours by only 1 or 2 clicks and then you can chuck your worries out the porthole. Little known fact that you can do this on the DME. I ran mine 1 click off stock when I had both the cat and muffler BP's on and did feel a difference and the Poping was amazing. If you ever plan on putting a Steve Wong chip in you might as well disconnect and open up your DME for practice, it's easy and then you can really see that fuel adjustment switch I'm talking about. The istructions on how to remove and open it up are on Steve's website at 911chips.com Post again if you have more questions.
Awesome ship you have there. Is it a Cigarette? I went for a ride last summer in an acquaintences 42 foot Fountain which had twin 454 supercharged big blocks that took the hair off of my scalp. I never imagined how fast those ships are. We hit 120MPH in no time and my heart stopped beating and I saw my self from above and began walking towards that white light everyone mentions seeing. He said he gets about 2 miles to the gallon running hard. I was in a zone the rest of the day.

Safe motoring...and sailing