I run 96lb injectors currently. They are maxed out on duty cycle making 540whp@9,000 rpm. I have a 1200hp areomotive fuel pump with a fuel cell with all new fuel lines. So volume is not a problem. I thought too when i bought those injectors they would support alot more hp but i found out otherwise. Basically like Jason stated the high rpm's along with boost eat up alot of fuel up top. I'm going to 1600cc myself. If the car was street driven alot the biggest i would go with is 1200's. This way you would have better driveablity.