I agree with
F20C. Lowering your car is a good place to start modding. I know Mugen is working on a lot of products for the RSX (intake, headers, etc.), and if they have not yet been released to the North American market, they will be soon. For more info, check out King Motorsports (
http://www.kingmotorsports.com/). You can be absolutely sure that many other manufacturers have performance upgrades in the works as well.
And welcome to AF.