I ve seen a lot of diff fuel injector mods....just wondering whats a good set up for about 300 -400 hp ....? 550 cc primaries 1600cc secondaries is this too much for about 250 hp

 

One thing that helps with sizing injectors is you should try to have primary and secondary injectors that are about the same flow rate, it helps to smooth out the transition. 1000/1000 would be good for 400hp, just make sure you have some reliable way to control it.

 

That would be more then enough for 300-400, in fact that would be gross overkill.. What type of fuel management are you looking to run?