I've noticed this noise before and just thought it was normal sounding but a few of my friends pointed it out recently and I've been kind if worried about it since. It's a high pitched whistling sound when I accelerate hard. It's almost like a very high pitched air noise. I've tried looking at all the hoses and I can't seem to find a vacuum leak. I have an injen intake and a catback exhaust with a muffler delete. Hopefully someone here can tell me more about this noise im hearing.