if it is still on mfi then their is a small black unit on the side of the metering unit with i think is a white connecter on their you can increase the fueling alittle remove this block and the screw then thier is a very small allen key just nip it not to much then put it all back together and then you will have to set the co up after that to . this is what i have been told but as usual you should really let a pro set it up my mate did my one went right over the car and set the base idle for the fuel for me and i was pushing 16 to 17 psi on standard intercooler it never pinked at all even four up