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My 66 Coronet Hemi tribute has stock manifolds and 2 1/2" all the way back through some Dynaflows with and an "H" pipe. The 472" Hemi pulled 425 at the wheels, which is probably close to 500 at the crank. So maybe it's a "+1" from a stock Hemi. How much would headers improve this? Would I...

Hemi converted (don well ) from 6 cyl car. How are the exhaust supposed to terminate out the back of the car? This looks shorter than it should be. And, what is that stout bracket with the hole in it (one on both sides of the frame near the bumper)?