Im stumped. Customers car in at work. Supercharger will not go over 3.5psi Specs are as follows. Stock LS400 series 1, 1uz engine with stock headers. Megasquirt ECU with RX8 injectors and wasted spark ignition set up. TBS "the blower shop" Billet 671 Supercharger. Running a 30 tooth crank pulley and 38 tooth top pulley. AEM water/methanol injection system. Twin 4 barrel carburetors above blower (used as throttle bodies only) Using calculations provided to us by the supplier and various references from the manufacturer we should be producing between 8 to 12 psi. The most we can get is 3.5psi. The vehicle was dynoed last week with 260hp at the wheels. Any help or ideas would be appreciated. We are at a loss as to whats wrong.