I have a updated 2006 model c2 VTR

I cleaned out the factory airbox yesterday, found a few large dead insects in there and leaves etc, now after i cleaned it and put it all back together and onto the car it is now making a whistle noise from 4,000rpm right upto red line.....

Ive always know about the belt whine that is common with these engines, so i know this is a new noise.....

When the window is down it is very pronouced......and with the windows up it sounds like its coming from the rear of the car, so the exhaust also crossed my mind but had not touched it at all..........

Im not too sure if i should worry about it or just see how it progresses and see if it gets any worse........

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