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I had a rattle in my ERA stainless pipes for the longest time. I finally took them off to do some other work to the car and discovered that there was a loose nut laying in the bottom of the side pipe. I have no idea how it got in there. I removed the nut and no more rattles.
Personally I would be very hesitant to just blindly run a screw through my sidepipe hoping to catch the rattle point. Maybe you can use a bore scope to better evaluate where the rattle might be coming from and the best way to address it.
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