I just had my ART Pipes installed. I drove for about 25 miles without a noise. Stopped at my girlfriend's, and then drove another 10 miles home. When I got off the highway, I noticed this horrible metallic noise, like a pebble getting rattled around in a tin-can. It's pretty apparent in this video.
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Can anyone help? Wtf is this? Is something loose? I know my shop cut the bolt on the driver's side of the exhaust - was it not cut enough maybe?