can anyone tell the difference between the old two chambers and the new delta flow series? My car already had flows on when I got it. They're not as loud as normal two chambers, but they're louder than the old three chambers. I'm guessing they're Delta flows but I want to make sure. I can tell how the inside of the muffler is laid out from the welding points of the chambers. Does anyone know where I can find out? If I do find out they're delta flows, does anybody want em for dirt cheap, no rust?!!!