Hello
I just got finished installing a cobb lightweight pulley. Everything went fine but on the test drive I noticed a high pitched squeak at 2900-3000 rpm, most noticable during downshift. It seems to be coming from the turbo area but I don't see how the turbo would be affecterd by the install or by the rpm like that. It only happens at these RPMs, I am hitting target boost in all gears and aside from the noise everything is peachy. The noise does lessen as the vehicle gets warmer. Could I have tightened the belts too much? I'm kinda stumped at this point so any and all suggestions are welcomes, thanks much
Cheers
Charlie

 

belts squeal cause they are loose, not too tight.

 

^^^^ +1 on that