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I removed my exhaust on my 2014 L99 SS Camaro and installed a flowmaster setup. I checked fit and clearance and everything seemed fine. The problem is that when i started driving it very slowly, around 10 mph, I started hearing loud vibrations from the back end. Is this the emergency brake? I cant think of what else it could be.
Check the tunnel brace. I had a setup that I put in and it was rubbing the tunnel brace, so I had to move the whole thing up and backward. Put some washers in, if need be, or get an aftermarket brace. If you want, take the tunnel brace off and test drive it to see if the noise remains. If it's gone, that was the issue. Common issue.