[Import2nr99]

I wouldn't worry about a camber kit unless you drop your car more than 1.75 inches. but any more than that and you're gonna need one. As far as hp.... Instant and serious horsepower can be achieved by turboing your 420a. Hahn racecraft (hrc) makes a kit and so does star performance. But be careful when doing this if your engine has high miles or wasn't taken care of the best. You also might wanna upgrade some internals. Everything else you need will be included in the kit. Other than that the standard mods will help, headers, exhaust, intake, etc. but none will come close to the power you will get from a turbo.