jus had a stage 3 head wiv piper cam an verner pulley fitted 2 my series 2 rst, and now the turbo dont spin up an the dumpvalve isnt dumping anything, it starts an runs ok.... jus i hav no boost at all and it drives like a xr3i! it was runnin an boostin ok b4 the head was changed, any ideas cuz i need it sortin asap cheers