I have an after market PCM like a dhp and after the case learn my car will pull like crazy up to 90mph, after that my boost gauge falls to half and it feels like my car has hit a limiter just like the TCS does when you spin the tires. It does this no matter how hard into it I am, even if I slowly go over 90mph then get into it. I am running a 3.2 pully, 2.5" off road pipe to the stock mufflers no cat u-bend or res, and a K&N CAI. The plugs are 41-101 I think they are like the stock heat range or one cooler which were put in with new wires in aug. Any clue what maybe the trouble? Do I need to go to a cooler plug? oh ya the car is a 98 GTP last scan for kr was around 1.2* and I have a 180*tstat.