well my 2001 prelude finally died on monday (ringlands most likely)... My motor is being built next week and i was wondering what size injectors i should buy for it?... im gonna be running 10psi daily and 17-19psi on track days... so im shooting for 400hp or a little more...

 

I'd say 550cc should suffice. But if you want to be double sure it will be enough, just go with like 650. 650 would definitely be plenty for 400whp. My 550's are working well....I am putting down about 331whp @ 7500rpm so at 8500rpm it should definitely be close to 400whp (at like 75%+- duty cycle).