Alright I know cat's sound great on an 8, but on the flowmaster website they have a 99 3.8 firebird that sounds awesome with just the muffler. I was thinking of getting the 80 series muffler by flowmaster, and just doing the piping. Is this going to sound good, does anyone know?? Oh, does anyone know where I can find an exhaust reducer, 2.25>2.5 in?? the 2.5 is the smallest the 80 series goes for outlets. Thanks for the help guys, later

 

I have a 80 series catback on my 6..sounds good to me..

 

You can probably get a reducer from AutoZone or some thing like that. If the kit is made for your car I would not worry about a 1/4inch. Plus a 1/4inch will not hurt any thing it just might help it breath better some. Flowmasters always sound good

 

Where did you get the exaust what brand and how much?

 

If you want to make power you should get a cat back, as the main restriction is where the tailpipe goes over the axle and gets squeezed down to 2 1/2 in, changing muffler does not help the restriction. If you want more noise, just change the muffler. What I found with sixes, is that you can get a nice rumble at idle, but the higher they rev, the more they sound like a six. Which is not bad, just a matter of taste.

 

i have a 3.8L and i put on a 80series muffler well thats what it came with i got the cat-back american thunder flowmaster kit... and i also put on a vibrant cat... it sounds real good.. nice tone and noticable when u get on it