what exhaust system is everybody running with their ls1? my iroc had a flowmaster already on it. i know they are restricting my 1 3/4 3" collector hawks. i am between the slp loudmouth II with borla muffler or borlamouth and the magnaflow built for our beloved 3rd gens, give me your your thoughts or links. thanks

 

There is only one catback to put behind an LS1....and that's the GMMG.

 

If I could afford it, GMMG hands down

I reused my LM1 from the 305 and dont really like it. Ive youtubed extensively and LM2 is the prime candidate for a replacement

 

I love the sound and look of the Borla.

Here is my brothers 96 Trans Am with an LS1 conversion with an SLP 2 on the Left Exhaust with longtubes and ORY.
http://www.youtube.com/watch?v=V7yhFo33ilQ

 

texas speed rumbler. the catback that doesnt really muffle =D

 

I'm using a Magnaflow 3" bullet that sounds quite amazing. You could easily make a dual system with those or a y-pipe setup into dual tips, both of which could run out to the rear bumper for the "cat back look".

 

Eww God no. Those sound terrible.

My vote is a stock ls1 catback with a 3" e-cutout installed.

 

mines the stock manifolds (01,02) 3rdgen slp 2 out catback

 

You just haven't heard it on the right motor.