Exhaust
#2
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An ls1
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#4
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I have a Flowmaster 80 series muffler on my 1998 v6 Firebird and it sounds better than stock.
#5
Launching!
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There are a couple Youtube videos floating around of a Grand National (3.8 V6) with an SLP Loudmouth resonator installed. Personally don't have any experience with this set up, but the video sounds pretty healthy, and I was keeping it in mind if I ever get the itch to change out my GN's exhaust.