My 3800 is a very interesting sounding engine, it makes all sorts of sounds depending on what rpm you're at. All are normal sounds though it seems, kinda like a whistling
You can hear it in my other noise video at 1:22 https://www.youtube.com/watch?featur...&v=JTBMx-kVZSI
that video was for a wheel bearing noise but later I noticed my 3800 makes a whisting noise sometimes too, usually when it's below freezing. I just assume it's sounds coming from the exhaust system.