I am wondering what choice of custom built exhaust people are using with a header. My good friend runs a great exhaust shop and he built me a very similar system to the cat back magna flow/borla street system using fairly quiet regular turbo brand mufflers. I installed a header and now that system is no good to me. It sounded loud as hell and raspy. Very civicish. I am making a new system close to the alta system except I am using 2 1/4 exaust with magna flow straight through 16''resignator and single oval muffler out using the stock cat. It is still too loud. Now what? What should I use to create a more quiet system?

 

I had 3 custom exhaust sytems. The first two were similar, one was loud and the other was quiet. The only difference between them was the gas stayed more in the quiet system.. If I had photos it would be more helpfull to you. I will talk to my mechanic which built the exhaust and I can inform you better

 

OBX header, magnaflow cat (good to 390 cubic inches), magnaflow muffler, 2.5" piping, and way, way too loud. TonyB just put in a coated SS header, and has a custom exhaust and is happy. It's in the cat, ressonator and muffler choices that make the difference.
PM TonyB to get more details.

Matt

 

i have a proto type header w/ no cat and a 3" straight pipe. now that's loud!!!!

 

Don't forget you have a large TB, Head and a Header!...that's going to make your exaust loud no matter what you do...If you REALLY want it quiet, try putting the stock system back on and see what happens -- Johan

 

My mechanic just went and visited a magnaflow rep and came back with a newly designed stainless 2 1/4 resinator that tapers down in the middle. It is supposed to make a huge difference. It is not on the market yet so I get to test it out! We also made the last S shaped bend before the tip out of 2 1/2 stainless to make a better transition. Thankyou everyone for the great responces. I will let you if it sounds good. I probably will not go back to stock ...Although I like the drivability better with a little bit of back pressure.
-Clint

 

TonyB is the man here - SS header and running the straightest exhaust that one can achive.

of course it did come at a cost - battery box and recently a rear valence

you gotta pay if you want play

 

I finished the exhaust. It is still too loud but it sounds deep. I recommend magnaflow stainless resonators. I have one magna and an apex 16" right now but I am putting in two magnaflows instead. I really dont want dual exaust.

 

I was thinking of doing a custom exhaust too, using 2.5 piping with a magnaflow muffler. However, I don't have a pulley, just CAI, so I was worried that I'd screw with the backpressure too much. I think I'm going to go for the TC Sportline 2.5 exhaust instead.

 

Clint, does your system have a resonator built into the mid-pipe? they don't really muffle anything (not much help) but remove the raspiness of the exhaust note.

 

Here's my system.
I use that with Supersprint headers.
(Ive also added a center muffler after the pic was taken, still sounds too much, but hey, fullflow mufflers and racecats werent created for the sound).