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      11-07-2012, 04:15 PM   #17
Sleeper519's Avatar

Drives: 08 E92 M3 DCT
Join Date: Nov 2009
Location: Atlanta, GA

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Originally Posted by mhabs View Post
BMW actually puts real engineering work/R&D/wind-tunnel tests these add-ons prior to marketing. For this and the front splitters, BMW claims that there is additional downforce generated (per original press releases). While probably not noticeable especially at legal speeds, a even a few lbs of downforce or lift reduction is a win, plus you can't beat the OEM quality/looks that you want to retain with a $65+k car.
^ +1

I love mine, looks great. And I don't presume that its giving me any real added downforce in corners like a wing would, but I DO feel the lift reduction on the long backstraight at Road Atlanta where you can get noticeably light over the last rise at 140. Now it feels rock solid. I think it definitely has some functionality along with the aesthetics.

2008 M3 Coupe / DCT // StopTech BBK 380/355 / Pagid RS29 / Motul / Apex Arc-8 / BFG R1S / Ground Control / MS filter / Performance spoiler / BPM tune // Road Atlanta 1:39.70 / VIR Full 2:10.87 / Barber 1:42.20