When running my Cabbie RS I get a loud whining noise coming from the front when running above 15psi. I've checked all boost pipes etc and can't find anything wrong. It has been mentioned that my Turbo could have oil starvation when boosting above 15PSi could this be the cause I am running a standard new Oil Pump which is running good pressure. Do I need to upgrade to a better oil pump when running above a certain PSi.

Cheers
Dave