was messing with my fmic the other day trying to make it fit better behind the front bumper and was also replacing my drive axel. after I drve it out I was getting unusually high vacuum readings, about 5-7 hg more than I remeber and the car now makes a whistling noise when I'm on the boost. boost psi is also down by about 1-2psi. was wondering what this might be. re-tightened the fmic clamps and everything was on good. thought about leaks but wouldnt vacuum be less?

 

what are your vac numbers? Are you sure the vac you were seeing wasnt when you were off the gas but in gear and moving? id triple check the hose clamps.

 

does your boost get progressively less over time? i had a similar problem, i noticed a few psi were gone and the turbo seemed alot louder, then after 50-100 miles i noticed the boost was cut in half. it turned out a hose going from the intake to the DV was rubbing on a belt. its a rather tight fit. check that hose for leaks. also my gas mileage was terrible and when i was on the boost the car had no power due to unmetered air getting in/out