Hey guys so my fuel pump started whining and misbehaving so i found AMS 320lph with install kit for the evo 9, my question is if i install the ams fuel pump do i need to tune in any way or is it plug and play

 

Have you done any tuning before hand?

 

a little tweaks on ecuflash

 

You might stay the same air fuel ratio unless it drastically raises your fuel pressure during wot.

Install it and do a pull and log afr.

Might need to adjust high octane map to compensate target afr or it goes super rich youll need to adjust fuel globally i.e injector size scaling then adjust latency according to trims