I dont think you will have a problem with 650whp on e-85 w/1200cc injectors, I was told the stock fuel setup w/ one intank wahlbro and one inline wahlbro and 1000cc injectors will support 550whp. I would think you would prob need upgrade your fuel lines anything more than 550, which you prob have already done, but I am def no tuner, just relayin the info jeff sent me.