I think it's related to constructive interference at different engine speeds, so switches w/ access to different exhaust lengths would be the best. Kinda like ACIS... But, for any new car it's easier to just optimize via exhaust valve openings. Maybe it's easier to drop one of those new fangled engines in than screw around w/ some funky system?
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Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
Three6Eight 
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