Originally Posted by B20B-T

I just installed a walbro 255 LPH fuel bump in my 99 GSX. I have a turbo back exhaust, big16g turbo and tubular manifold. the car drives fine when not building boost but after it goes above a few psi it starts bogging and hesitating, it also feels like it's lacking power and if I really get on it it will backfire. Am I getting too much fuel or too little? I also clamped the fuel line coming into the fuel rail with a pair of vice grips but I didnt cut it all of the way off, this seemed to help a little but im not positive.