Quote:
Originally Posted by OrbitalEllipses
As far as the diffuser goes, there's been talk of the stock muffler aiding in reducing lift at the rear (posters and I believe someone tracked down an official comment).
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Absolutely, it reduces lift! Like a golf ball, therefore woooosh! \s
The dimples will initiate a turbulent boundary layer, which will hug the diffuser further up the rear. The higher it goes, the less wake cross-section. I expect the contribution of the dimples is very low.
The main way the muffler reduces lift isby providing a smooth transition between the pumpkin and the bumper. They could have left it level, but angling it will prevent the flow from getting too caught up in the rear suspension area. I'd hope that the aftermarket exhaust kits maintain that slope, but most welders are more concerned with fitment than aero.
