Help With Exhaust Please

**nymk41.8t** · 10-09-2008 07:53 PM

I am going to purchase 2 magnaflow 14851 mufflers for my 2005 S4. i have a shop that wil custom make pipes for me to fit my car. My question is this do i need to buy magnaflow cat's too ?? X-pipe ??? or just have the do piping from the cat back on the car ??? please let me know what would be the best idea and sound the best on the car. I just purchased the car last month and am new to the audi game. I came from the big turbo VW gti world and would like some insight from people who have knowledge on these big V8's

thanks in advance.

Vinny

**RAudi Driver** · 10-09-2008 08:56 PM

Do a 2.25" piping from the cat back to the rear. You won't need cats but might want some small resonators.

**V8S4Fun** · 10-09-2008 09:33 PM

Naaa...skip the resonators

**...Mark...** · 10-10-2008 07:46 AM

Originally Posted by RAudi Driver

Do a 2.25" piping from the cat back to the rear. You won't need cats but might want some small resonators.

I'm new here as well and have a question. Most cars have an 02 sensor after the cat, do these cars have them there as well? If they do, and he pulls the cats won't it trigger the CEL?

**Captain Insano** · 10-10-2008 07:50 AM

All he would need is a bung to fit the sensor back on and an adaptor / mechanical CEL defeat. That would eliminate any CEL.

**nymk41.8t** · 10-14-2008 07:44 AM

any other help out there ???

**trexturk** · 10-14-2008 03:53 PM

you wont change the cats on just a catback system.
Just buy a h or x pipe and take the 2 magnaflow mufflers and have them use 2 1/4 tubing from rear converters back

**nymk41.8t** · 10-18-2008 12:47 AM

thanks alot for all of your help i will def post up some pics as soon as i have it done. if there are any other ppl ou tthere with insight please let me know. Also im thinking of using the 14851 magnaflows. ive heard they sound the best on a b6 S4 v8 beast lol. any other magnaflows out there that would be good please let me know