What pulley you running to only see 4lb of boost?car was like that when I bought it I've only owned it about a month I'm mostly concerned with your comment about not sure of the timing though. That's an important thing to know when running a car with boost. I'm going to check the timing today haven't had the chance to check it . How's the oil and coolant looking?oil and coolant looks good no signs of head gasket leak or anything Any chance there could be a head gasket problem? I run a stock radiator on my car with a S-trim pushing 15psi and the absolute hottest I ever see is about 190deg. Make sure the fans are coming on and blowing in the right direction. Might also make sure the radiator cap is in good working condition. I've seen them cause overheating issues as well. Oh one more thing... What is the stock gauge showing for temp? The stock gauge was running around the L in normal I've seen gauges do some weird stuff if there is a air pocket in the cooling system.