Ratchie, I agree with your point, but your general concept is wrong.
Two 2.25 pipes with "ugly" crush bends (effective diameter of 2 inches) will flow as much as a 2.8 inch pipe. Which is plenty for all but the most extreme blown SVTs. (Remember the infamous 3.0inch SMA system? It actually lost power over a well designed 2.5 inch system....) But its not the equivalent of a 4 inch pipe. In fact, cross sectionnal area of 2 2inch pipes is half of that of a single 4 inch pipe! But then, everyone will agree that a 4inch pipe is overkill on pretty much all svts....or street cars for that matter...
So my point (yes its coming) is that the mandrel bends would be important on the cat to muffler length on a cardoc system (to keep the inner diameter a nice even 2.5 inches), but the advantage is negligeable after that.
Marco Tatta
98.5 SE MTX, Duratec
EGR block, fog light
fix, custom shift boot, monsterflow intake, Ecotek valve
Quasi dual cardoctor exhaust.
Hacksaw short shift, Momo race "s" carbon knob, ghetto rear strut bar, 16 inch cougar wheels with 225/50/16 kumho 712s
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