[QWKSNKE]

How long have you had the car? What is the time frame that you last saw 15 psi. Reason I ask, is that you will lose boost (not make as much) with our current temperatures being so high. Like someone else also mentioned, you need to check your air filter. How many miles are on the car?

Italian, the stock gauge only goes to 10psi so he must be running a aftermarket gauge to be able to see 15psi.

I also agree with Italian in that it can't be boost leak. The way the system is designed in those applications it can't leak without a bad running engine being one of the systems. Gotta remember the blower is on top of the motor, therefore the only boost pressure there is between the top of the motor and the heads. Its not like he can blow pipe or anything.