Quote:
Originally Posted by swamper650
Those 3 holes are not factory ! I know cause I tried the same mod on a stock can sounded lousey......Plugged them back up and the stock sound or rather lack of returned.
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So it is a reason of annoying noise

Have you noticed any power/flexibility improvement after drilling those holes?
How have you plugged them back? With screws or welder?
Regards,
L.