I've run mid-12's in mine. NOS, Water/Meth, 64mm Turbo, 225cc Injectors, SCT, FASS, Full Fuel System, etc. Now she's back to stock with a new engine! PAY Attention to the Low Pressure Oil Pump. They're easy to blow at the higher RPM's (4K+). Blow it and you'll bake the engine like I did.