im not imagining it, since fitting a bailey dv26 dumpvalve to my 2008 st2 im having problems, 1, the turbo isnt winding up as early in the rev range and it is holding back when in high revs, also the turbo whistle is clearly louder from inside the car, could this be due to incorrect fitting? would appreciate help from a professional before i bin the dumpvalve and go back to standard... cheers