Originally posted by bruce_91zx
I don't know much on what has been done or proven or the numbers behind that, but I can give you my opinion from an engineering perspective. There is a difference with mandrel bending, there has to be, FROM THE CAT BACK.
Until someone proves me wrong, I am sticking to my guns on this. What affect does turbulence have on the performance aspect of this stuff? I still say that if you take my car and put 2 1/4" crush bent piping on it from the catback and hayame muffler, the numbers would be identical to the same setup but w/mandrel bent piping. No increase or decrease.