SR20Development.com, JimWolfTechnology.com, HKSUSA.com, AEMPower.com. Just a few. By the way, intake/header/exhaust should give you about 135-140 hp at the wheels with 125-130 ft-lbs. of torque. Street cams by JWT have been shown to give 160 hp, but not much more torque. I have 142 hp and 128 ft-lbs at the wheels right now. For steering feel, check tire pressures and inspect the struts. I just finished putting brembo replacement rotors on all four wheels because until I get bigger wheels, I wasn't sure about the AD22VF brakes fitting under my wheels, they should fit, but it was expensive and I didn't want to risk it right now. The brembos seem well after 2 weeks of driving them hard. Also, I have my timing set at 17 degrees. I've heard that's optimal until you get a Jim Wolf ECU, then 19 degrees is optimal, but you have to use premium gas(92 or higher). Somebody correct me if I am wrong.