Flowmaster has two catbacks, One is the American Thunder, which is alot louder then their other LT1 Cat-back. What is the actual difference between these two? I have to American Thunder one on my car. Does one flow better ( Have less internal baffels ? ) then the other since its louder?

 

I believe is just a 3 chamber (American Thunder) and a 4 chamber muffler is the only difference...correct me if i am wrong though.

 

lol your awnsering all my stupid exhaust ?'s today ... Thanks

 

I think the American Thunder is a two-chamber muffler design--i've got it on mine with stock tips, LT's, and o/r Y-pipe, I love the way it sounds!!!

kevin