and cant figure out where its comming from. I thought it was a boost leak but in the back of my head I thought it might be the tranny. It whistles loud when ive got the idle kicked up to 1800rpms while in park. My fried said it sounded like a tranny whine when he heard my truck on the dyno. Any ideas? ive checked all the intercooler tubes for leaks and couldnt find anything. I had the intake off installing a boost stick. I wonder if its worked its way loose?