high flow cats worth it ?

[mrtwilcox]

I was wondering how much a set of high flow cats would help out my 95 993 . I allready put on a set of Fabspeed mufflers and love the sound and the little bit of extra grunt they gave the motor. At aprox. 1200 to1500 dollars the few different brands i have seen hopefully would work well . Any body have any experience with these or any thoughts would help . Thanks

[993inNC]

Yes they can as well as shed a little weight off the rear of the car. Click on the link in my signature, follow to the dyno pages

[993inNC]

No, sorry, its not a placebo. Free flow is free flow. He may have noticed a small amount of quicker spool depending on what he bought, also I think their mufflers are are actually lighter than stock which lessens the weight in the rear. Sport cat pipes also reduce weight and definitely add to a freer flowing engine, which in turn provides for a better than 3-5 horse power gain (as evidenced by the dyno sheets of just a few of my past customers ).

[993inNC]

Okay, fine you did it so the car would sound better, I get that, but you can't discount the fact that the pipes (either sport cat or by-pass) do offer increased flow which translates to HP.............you just can't! It's dyno proven and they all can't be wrong!
Now as for the mufflers, MrWilcox says they gave the motor a little extra "grunt" is that "power"? or sound? grunt to me is sound so until that gets cleared up we really can't discuss it other than to say mufflers don't really add power being that far out in the exhaust flow. Cumulatively though, 10 pounds here and there start to add up quick which does translate into a better use of the power at hand. Plus it goes without saying that diminished weight at the rear allows for a better handling car.

It all makes a difference, just depends on how far one wants to carry the mods.

MrW. if you are still watching, I have some customers in the bay area that would be happy to showcase my work for you. PM me and I'll get you the contact info.

[trev0006]

I think the weight savings is worth it.

[993inNC]

wrong end and its probably more once painted (than a bypass pipe)

[kang]

Porsche did a darn good job with the 993 exhaust. Perhaps too quiet for some, but they must meet various noise level requirements.

Like everyone else, the engineers at Porsche know that freer flowing exhausts improve performance. They also know that you can tune an engine, to some degree, with the exhaust. It’s no secret to racers, either, as NASCAR teams use various exhausts at different tracks to change where the engine makes the most torque. Same thing for karts. You can buy all different kinds of exhausts for karts that change the torque curve of the engine.

Aftermarket exhausts advertise as making 10 or 15 more HP. But what they don’t tell you is that you lose torque down low in the revs. I’m sure the same rules apply to high flow cats. This is a known effect of freer flowing exhausts. They make more HP up high, but you lose torque down low. You must make some sort of compromise between the two, and in my opinion, Porsche did an excellent job.

I wouldn’t tell anyone not to get an aftermarket exhaust or cats because of this. I would just say be aware of the trade offs. You might like the sound, or want to shave a few pounds of the tail, or whatever.

[993inNC]

Actually its not until you go to a by-pass pipe that you see the down low power disappear (made up on top end). With sport cats (as you can see on my dyno pages) the power is pretty linear over stock.

[mrtwilcox]

Wow spirited conversation . I have been doing mods 1 thing at a time ,first was a cup airbox cover ,maybe 3 to 5 HP then a performance chip maybe 7 to 10 hp , then the Fabspeed mufflers , again maybe 3 to 5 HP . and I did notice a little more grunt each time I added an item . So I am thinking ( and money isnt really that much of a concern),when its all done I should have 20 to 25 more HP . Now who wouldnt want that on there IMHO , the most beutifull car PORSCHE ever made. So I am going to check out the Dach pipes , and thank you all for the info .

[993inNC]

You're very welcome. Look forward to hearing from you.

[mrtwilcox]

Originally Posted by Noah

The important thing is that you believe this to be true.

I plan on having my car dynod in the next few months maybe sooner . If it turns out to be a lot of waisted money , so be it , but I have waisted more money on other hobbies that were much less fun . You only live once , try things , thats how we learn . Also , I a can feel a very real difference when I switch to the stock airbox and stock chip. About a 10 min change , if the mufflers took less time I would change those back and fourth too. (Believe in the DYNO)

[mrtwilcox]

Originally Posted by 993inNC

You're very welcome. Look forward to hearing from you.

Wow , those are works of art . I am guessing they will work fine with my Fabspeeds as they bolted right to my stock cat. Also those look quit a bit lighter than that stock anchor on the back of my car now !

[mrtwilcox]

The cats themselves look to be stainless but what about the rest of the tubing on the x pipes . Stainless seems to be the industry standard for aftermaket exhaust systems

[993inNC]

The pipes are all 304 SS. Its just the difference in tubing vs. cat housing that is the difference but its all the same material and all TIG welded, flanges are roughly 3/8" solid SS.
If you'll go over to Rennlist.com and search the 993 board for DACH, you'll find pages of info, opinions, etc on my pipes

[Halm]

Chris, Harvey and Jeff have sold me on your pipes. Unfortunately, they'll have to wait a bit longer than I thought... I ran into a deal on a set of BBS RS-GT wheels that I simply could not turn down.

[993inNC]

Originally Posted by Halm

Chris, Harvey and Jeff have sold me on your pipes. Unfortunately, they'll have to wait a bit longer than I thought... I ran into a deal on a set of BBS RS-GT wheels that I simply could not turn down.

LOL..........cool, I understand, they are a nice wheel! I'll be around, just PM or email me when you're ready. Harvey sold Jeff on them, I know he's a big fan the pipes and tries to talk them up whenever he can.

I look forward to hearing from you too

[mrtwilcox]

Question , do the cats have the C.A.R.B. #s stamped on them .I am pretty sure that the car would pass the California smog test , but if I got a real gung ho tech doing the test , it might not pass the visual test unless those cat #s are stamped and the C.A.R.B. # is in there system . I think ?

[mrtwilcox]

Originally Posted by Noah

I completely agree. If you want to make it an honest test, you'll have to do back-to-back runs on the same dyno with the car in stock configuration, and with all the mods. Good luck, I wish you all the horsepower you're hoping for.

thanks , should have the first DYNO runs done in a few weeks

[993inNC]

Originally Posted by mrtwilcox

Question , do the cats have the C.A.R.B. #s stamped on them .I am pretty sure that the car would pass the California smog test , but if I got a real gung ho tech doing the test , it might not pass the visual test unless those cat #s are stamped and the C.A.R.B. # is in there system . I think ?

My pipes will pass any inspection, and in answer to your question yes they are stamped both CARB and EPA. I have many sets in CA and have never had any issues.

[993inNC]

okay here we go, the sys wouldn't let me alter the last message