at a cold start my car in making a loud winding for about 45 seconds then stops, seems like it is getting worse. At first i thought it was the turbo but my gauge is showing no pressure. So apon some research sound like it could be the secondary air pump failure? I have the stock box out and am using a k&n filter and custom heat shield. Should i look into the SAP removal? I can't seem to find out what others did, just that they had the same problem.... p.s. yes this is the 3-4 problem in a couple of months with this car. thanks in advance