While the spoiler and lip look great, can anybody feel difference at speeds <80 mph? I would consider this mod only if it helps performance. Does anyone know how much downforce the spoiler generates on the rear end?

 

it only works if you run on the highway running 160 mph, so dont worry and buy it

 

So basically, it's only for looks because you can't go past 156mph? Or did I misunderstand?

 

Does the kit include a diffuser under the muffler?

 

how much does the underbody diffuser help? supposedly on the G35C, it lowers the coefficient of drag by 1....

 

Cd 0.30 for non-aero.

Cd 0.29 for aero.

I don't know if you can feel the difference. But it LOOKS cooler...

 

exactly is only for looks good