how can i improve my car performanc??
i have a bmw 530i 2004, with 1 psi supercharger and surge performance chip (i bought them from myhotbmw.com) reaching approx. 255 bhp from 231 bhp!! i need more power in my car... what is the next step?? did i do the right thing? am i in the correct way for improving my car's performance.
Another option might be a performance cam.