I did the same polishing to the tail piece of the Magnaflow system on my GTV. A few different grits of sandpaper strips, and then I took it to a buffing wheel on the bench grinder. Not a mirror finish or a mimic of chrome, but a nice stainless shine that looks great. I highly recommend that any Magnaflow installers take the time to polish the tail section - it's worth an hour and a little elbow grease.
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