Fabspeed Pre-Muffler Catbypass Pipes

[Justin@Athens]

So I like loud, and don't worry about emissions too much.

Is this too loud? OR is is WAY too loud for normal street use?

Fabspeed Cat bypass test video

I don't have a grand to blow on an exhaust setup but am looking for a change.

I am thinking that I might just get it and see, and then if it is way too loud just put a cheap dynomax of some kind on it?

Your comments are appreciated.

Currently stock

Justin

[krd]

What?? What???

[Justin@Athens]

That is sort of what I thought, but the video clip didn't make it seem so loud so I just thought I would ask.

Thanks

[oregonmon]

I've got a Bursch cat by pass. Not much sound difference. Even with a Magnaflow muffler. I also have a Fabspeed 'muffler' bypass. Now that is loud. I can only tolerate the muffler bypass with the stock cat. I started the car once with the cat and muffler bypass. My garage shook, it was WAY loud.

[Oh Haha]

The muffler bypass is exactly that. It eliminates the muffler. IMO, it makes the car sound like a POS unless your car is a high comression race motor.

Install a cat-bypass and an aftermarket muffler of your choice. You will enjoy the sound.

[efhughes3]

Haha, too loud? Not really. Try headers and dual out aftermarket muff.

[wildcat077]

If you're in the market for a cat bypass,i would recommend the MK unit for the simple reason that the O2 sensor captures both exaust banks as compared to only one for the Fabspeed...

Don't get me wrong,i love Fabspeed as i have their one in dual out muffler and after over 7000 kms with it so far i'm very satisfied with my choices !
Bt the way,it is not overly loud and there is no exaust drone whatsoever at any rpm

Phil

[dw1]

Be careful - you may be confusing two commonly used terms.

Cat. bypass is typically a straight pipe with no sound attenuation.

Euro-style premuffler goes in place of the cat. and includes some internal baffeling to attenuate the sound somewhat.

I'm running the Fabspeed euro premuffler with a Dansk 1-in-2-out (84mm outlet pipes) muffler. This setup is on the edge of too loud for my highway cruising comfort above 3K rpm. Not droning, just loud. However, most of the loudness comes from the dual-out muffler. With a muffler that was closer to stock (or one of my dual outlet pipes capped/plugged), it would be far more tolerable noise-wise.

BTW, if you live in an area with a lot of bikers, you can get away with almost anything. A fellow Pelican who lives just west of me was running a single straight pipe in place of the cat and muffler. While it sounded great (esp. at idle), it was a bit too LOUD for my tastes for a street car.

[Halm]

A few years ago I did a Fabspeed cat by-pass on my '80 SC. Absolutely the best bang for the buck mod I have done in 38 years of owning P-cars. The "butt-o-meter" said I had more power -probably because a 28 year old cat was not flowing well- and it let through some real nice noises the cat was muffling.

Be careful of 1 in, 2 out exhausts. They have a reputation of droning at cruise speeds. Maybe the MK doesn't but others are reported to become bothersome real quick on the highway.

[Justin@Athens]

Great things to know guys! Keep 'em coming.

Justin

[Oh Haha]

If you haven't already, take a look at this thread with many different setups.

The ultimate exhaust sound clip thread!

[dw1]

BTW, my Fabspeed euro premuffler + Dansk 1-in-2-out setup gives the car more of a "muscle car" sound at low rpm's. Not bad sounding at all, but not really appropriate to the car, IMHO.

At high rpm's, it sounds like a well-tuned race car. Great for short bursts, but tiresome on the highway.

The louder exhaust also makes it harder to avoid the attention of those who protect & serve. If they can hear it coming, the cops will pay more attention. You can probably guess how I know this.

[RarlyL8]

On a Carrera either the cat bipass or pre-muffler will add the same power as a set of SSIs due to the primary ID of the SSI being a better fit for 3.0L and smaller engines. This is well documented and not speculation.
To reduce sound levels you should use the pre-muffler instead of the cat bipass. They are the same thing with a sound deadening core added to the pre-muffler.
M&K produces both of these and they can by purchased from out host.

[TroyGT]

I have the fab speed euro premuffler AND I also have the straight pipe. Together, wow... I love the sound of a loud muscle car but that is just way too much. Love the high speed sound, but the idle at a stop light sounds inappropriate for a Porsche... too raspy and low. In a parking deck, geesh, I set off every alarm in the joint. Pre-muffler and stock canoe muffler... not a lot of difference. Pre-muffler and aftermarket exhaust, like Magnaflow, perfect. I do 1 out, not 2... don't like the drone... and it will drone with 2.

-Troy

[wildcat077]

If you're in the market for a cat bypass,i would recommend the MK unit for the simple reason that the O2 sensor captures both exaust banks as compared to only one for the Fabspeed...

I meant to say "pre-muffler" and by the way the MK unit is a wonderful piece of craftsmanship !

Phil

[chuckr]

I have the Fabspeed euro pre muf with their dual out exhaust.... really love it, yes it is loud
but not too loud for me, I find it perfect,just what I was looking for and I get lots of complements
on the sound. It is not for everyone though and I have the Fabspeed muffler and premuf so
it is the whole exhaust from Fabspeed....pricey !!

[Talewinds]

Originally Posted by Oh Haha

The muffler bypass is exactly that. It eliminates the muffler. IMO, it makes the car sound like a POS unless your car is a high comression race motor.

Install a cat-bypass and an aftermarket muffler of your choice. You will enjoy the sound.

Yep, Oh Haha you nailed it!

[glewis80SC]

I have the Fabspeed Cat-bypass into the muffler bypass for track days, the weight savings is great but for daily use it is a bit much. I love the sound, some do not, I get a lot of positive comments at the track though. Daily driving i keep the cat-bypass into the stock muffler which sounds "normal" not loud at all. I am saving to get a Bursch tuned muffler for daily driving, I think the sound with the cat-bypass will be cool. The fabspeed has held up well too, lots of track days with no issues. Here is a quick shot of me at Willow, you can here the car as I accelerate out of the shot and into turn two.

[lava]

I have a fabspeed european pre-muufler on my 87 Carrera, I could cut the cat off because it doesn't require an E-test due to its age. Sounds like it should. good deep tone in the cabin. Great echo off walls and fences. Under 92 decibels for the track. get it, you won't regret it. Unfortunately you can still hear the co-pilot

[SuperOldSchool]

Originally Posted by Justin@Athens

So I like loud, and don't worry about emissions too much.

Is this too loud? OR is is WAY too loud for normal street use?

Fabspeed Cat bypass test video

I don't have a grand to blow on an exhaust setup but am looking for a change.

I am thinking that I might just get it and see, and then if it is way too loud just put a cheap dynomax of some kind on it?

Your comments are appreciated.

Currently stock

Justin

The 3.2 in the video is my car. It sounds awesome.