I want a supercharger for my 05 GT.I would like about 425 brake HP.Roush only boost 5 psi adding 100 HP = 400 HP,with that what else can i do to get 25-30 more HP.I think running over 425 HP the engine will not take the stress as long as i would like.Roush pick up the balance of the factory warranty on drivetrain.Keene Bell offer 6-9 psi pushing the HP 100-150 more.No balance of factory warranty on driveline.Twin screw is a nice design though.Please help me make the correct decision.I live in Toronto Ontario, i don't know any installers of Keene Bell products do you? One last ?? will the superchargers change my emissions output? We have to test our cars every 2 years & they must be within the specific car design limits of emissions.Will my CO/NOX go up or stay the same?