Connected a boost gauge car is 03 WRX with PPP shows 15, just so smooth in how it delivers. If you charge through the gears by 3rd only getting 12, but into 4th back to 15.
If you drive on a light throttle as boost comes in you back off if need be, but if you then floor it gauge shows 15 but you are not surging forward more gaining speed, could this be the air mass meter? on golfs this kind of fault does NOT throw a code.
thanks