I have 3" aluminum piping and the clearance is tight being that I used v band clamps instead of standard flanges and I have no resonators what so ever and also have CSL headers. Needless to say it is EXTREMELY LOUD! I'm curious to know myself what the dB level is when I rev it, but you can definitely hear me coming down anywhere and I do set off alarms on cars when I'm driving around. Your head literally starts to hurt after awhile in the car so no long trips in it anymore. I might have a video clip somewhere of my car that I might be able to post up, but PM and I can shoot it over if you are curious to how loud it is.
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