Originally Posted by shawnu
Thats strange.. i know theres 2 or so 50 series... i dont know which one i had. Got it for free from my grandpa and figured id try it out and there was barely any difference. Even under WOT.
Correct, I think the older 50 Series was replaced by the 50 Series HD which is louder. I believe that's the muffler that came with my cat back system. I'm not sure if Flowmaster still makes the original 50 Series or not.