mira fiebrua,
i think you should go with the suspension upgrade ...yeah...more money but unless you are running EVOlike Horsepower your car is not going over 100 on the dragstrip...

 

you can get the carbon fiber front wind splitter, canards, rear diffuser at apr performance. they specialize in aerodynamics and they have a great tech section on their website...lots of info on aerodynamics

www.aprperformance.com

and all of there stuff really works!!!