hey guys, atm my cars running a safe 240 hp on 7psi its a series 4 mild port with microtech mt8, i want to push that to 400hp, i just received my 2lt surge tank today, i currently have a 225l/hr (500hp) walbro in take fuel pump and other then that i believe the rest of my fuel system is stock, my tuner tried to turn my boost up but the fuel leaned out, so i was wondering what size injectors i should get? if i should get a fuel pressure regulator? and the external fuel pump i should get? and also how to set it up
thanks guys

 

????????

 

This question has been answered like 50 million times.

and your tuner should know what size of injectors you need.