I have an 03 C4S and am interested in getting a little more growl out of C4S? I was considering Fabspeed's cold air intake kit and muffler bypass pipes, but was not sure if there were any problems/noises/issues anyone has experienced or heard of from these items. I'm not much of a gearhead, so I was planning on doing these mods myself in the garage, so any feedback would be greatly appreciated.

 

Don't everybody hop into this thread at once.

 

muffler bypass pipes removes the mufler entirly and is just a straight pipe out of the catalytic converter. You will pass emissions 100% since you arn't touching the cats. You will save a lot of dead weight..but your car will be just shy of supercup loud. It will be race-car loud and if u live in an area with old fart neighbors, they may not appreciate it and will complaine. Kids will love it, car guys will love it. I havn't been ticketed yet but that depends on your area and how agressivly your driving (if your hard on the gas you'll light up the neighborhood..if u feather it around, you'll be fine..if u see a cop..just feather it or throw it into neutral and roll by him).

 

are the bypass pipes themselves different between the C2/4 and C4S???

 

should be identical as i recall.

 

Nope different, C4s has a different exit point than the C2. I was going to do the bypass pipes, but was told I can't reuse my tips. Since I have the nice factory quad ones, I'm skipping.

 

^ you can have a pipe shop make you the necessary pipe and then attach your quad pipes to them

 

Has any one ever tried to do their own bypass with exhaust piping and having them bent and cut to fit???

 

^ shouldn't be difficult at all. I believe a rennlister went with some piping from a hardware store as a makeshift track setup.

The advantage of the fabspeeds is that they're pre-made and you get a new set of tips with em, but you should be able 2 do it yourself as well.

It comes down to a matter of effort vs. the ready to go solution i guess.

 

Try the pep-boys cheap way. Already made 90 degree elbows that fit. All you need is a tip. Its the cheap way of TESTING this out. I don't recommend keeping them on, as you should purchase the fabspeed bypass pipes if you wish to keep them on.
They were OK for me. Just not tuned enough so I went back to stock.

 

I saw those at pep-boys too, that was why i was asking, but that way might not fit, as said above, the exit point is different between the C2/4 and C4S...

 

well my effort is alot cheaper than $500(no tips)...

 

I had to cut the pipes anyways. I believe the C4 should be a longer distance so you won't have to cut as much as a C2.

If any Bay Area people want to try the pep-boys out, let me know. I have a pair for a C2 just sitting around and I might toss them. Already pre-cut and fitted.... ready to go.

 

Can anyone provide the part number(s) or specifics for the pep-boys elbows? I'd like to try this approach on before spending $500.

 

that is what i was thinking as well... Rocky, do you have any pics of the pep-boys pipes you have, as i am in the Bay area, my dad might try it out to see...