Originally Posted by bullitt5897

If your looking for downforce as a functional aero kit the Nismo (not s-tune) is the best option.

Here is how I plan my setup:
Nismo front bumper
--Center duct for Intake (installed)
--Brake Ducts (installed)
--Front Splitter (Still in development)
--Dive Planes "canards" (still in development)

Nismo sideskirts: They reduce lift as they protude and eliminate some air from flowing under the car.
--Side blades (In development)

Rear bumper:
--Cut and modified for custom exhaust and diffuser.

Rear Diffuser: I have a custom Difflow GTR diffuser modified to fit the nismo.

Rear Wing: The Nismo rear wing does a good job however I would put my faith in the APR GTC 500 with a gurney flap. This will be taller and get into more clean air allowing for more efficient down force... and its adjustable...

Lastly,

Under body panels: I am working on developing a nice set that will work with side skirts and be efficient. Pairing this with my rear diffuser will do alot to reduce lift and increase downforce...