Car is MY98 fitted with full decat and induction kit. At this set up the car used to boost to 14psi and peak at 15psi. I have just had the ecu swapped for an ECU with a Power Engeneering Piggy back board. This ECU was mapped to run on a car with very similar spec to mine. With power output figures at 270bhp. Problem is my car is now only boosting to 10 PSI and peaking at 11.

any ideas ????