[Krueger///M3]

Originally Posted by masmole

+1

Exactly! I'm not a physicist or aerodynamicist but based on the fact that I've stayed at many holiday inn express hotels, in the case of aftermarket exhausts with separate canisters and nothing in between, you are actually promoting more differential cooling at the expense of increased rear underbody turbulence from the differential to the valence which increases drag and lift. Very minimal to make a whole lot of difference on a 3700lb car in the course of a lap so I don't think it's anything to worry about.

???