Exhaust for stock car?
1) Flowmaster/SLP Loudmouth/Corsa?
2) Whats the difference performance and soundwise in going catback and going just muffler?
2)Flowmaster POS, SLP Loudmouth (Good but too loud IMO), Corsa good all around. I went with Hooker, good performance (Low Backpressure) and awsome sound (Especialy at 2000/3000 rpm and WOT)
Personaly I think replacing the Y-pipe is more beneficial than a cat back.
WeS
Cheap alternative is get an ATR Pit-Bull muffler and a nice set of tailpipes to your liking! Those mufflers sound nice and deep on an LS1! That is what my buddy did with his Z-28. He put less than $300 in his exhaust and it sounds really nice!
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WeS
and for a budget catback you cant beat magnaflow. clip in sig. 

GMMG


