im gona bolt my tpi injection onto a motorha that has around 400-450hp and was wonderin what size injectors should be used for this and if thier is any other modifications i should do befor bolting this on?

 

More info on the motor would be nice, heads, cam etc etc, also that 400-450hp was probably with a carb, a stock TPI is going to choke that motor up alot. Also plan to have a chip burned ASAP or that thing is going to run like crap. Your probably better off getting a carb setup, it would be alot easier and youll make more power.

 

i would have to look at the motor to tell you more it is a carb set up right now and the cam if i remember right is like 550 lift or so and mabe around 250-280 duration i think, dont know for sure.