I have weapon-r intake, apex-n1 catback and dc headers 4:1 . what else do i need to do so my car will run a little bit faster? What do you think about the pulley, cam gear, ecu or vortec. Need input?

Unless you start messing with fuel delivery or get wayy into your cars motor and start micromanaging it your stock ecu is okay. It wouldnt hurt to upgrade but you dont need to now. IF you wanna run faster i would trade your weapon-r intake for an AEM. you get a better power curve out of the AEM. You could look into some AEM pullies. and cam gears. with your 99 si i would just go ahead and consider going on up to the turbo... Greddy mankes a very good but semi generic turbo which will put you at about 6 pounds of boost and will drop your 1/4 mile time by a second or more. After the turbo there are so many more possabilities. You also should consider your suspension. Look into Tokiko Illuminas and Eibach springs. Get soem 16" wheels and some preformance tires. This wil help you catch traction faster and allow your car to corner MUCH better. If you have any other more indepth questions Go to www.hondamod.com this is good forum with ALOT of knowledge. Good luck to you and keep it real and stay away from the rice....