Guys, I have a stock standard FG XR6T, and when the car comes on boost it doesn't have that typical high pitched whistle, the sound pitch is a bit off.(sort of sounds like a supercharger) Took it to Ford the other day and they tightened a few of the exhaust manifold bolts, but turbo sounds the same, and they reckon the turbo noise is normal. There turbo noise is easily heard in the cabin, and I just want to know if other FG XR6Ts, sound the same. Also want to confirm that the slight back fire in between gear changes (auto)...is normal for the car also...apparently this is spark cut out?