From the research i have done, They help slightly by directing air into the rad and keeping temps down. Where youll see the best gains is at the track, daily driving you wont see anything from it as far as performance. But the AUT CF CP looks dope, and also redirects colder air into the intake, and helps with colant temps. I have the Evasive CF CP, and i like it... Justs cleans up the engine bay IMHO...