I am running the AFC Hack for six months. car ran really good on 10-11 psi. Then motor went bye -bye( other issues ,not Hack) The only problem with the Hack is the it tends to advance the ignition timimg in the higher rpm's. But you compensate for that with the fuel the 450 's provide. Just retard the igtniton a few degrees . i also advise a upgraded fuel pump.