Just playing around and put my TS chip in 140hp mode and got on it no more than 5-6 secs. It did the normal stuff; black smoke, high pitch turbo noise etc... Now one thing I haven't ever heard before was more of a whistle sound. A lower tone than the turbo. Any ideas what it is? Is this normal?

 

Could it be the turbo fluttering. First time I heard it I thought I was blowing the turbo. Almost sounds like a warped skateboard wheel bearing but louder. If so its the turbo wheel. Just my .02.