hi,ive recently bought a h-plate series 2,i have a strange noise appear when the car comes up on boost,you can hear the turbo spinning up but then there is a loud whistle almost like a release of air from somewhere and the boost seems to hold back!! i have checked all the boost pipes which are samco,ive checked the three pipes from the amal valve and all appear to be fine.Could this possibly be a faulty throttle housing gasket or poss intercooler which is oe??any advice would be appreciated.....