well I've done it both ways and was yet to be burned. My clutch puck went out just like everyone elses NA. I got down to the flywheel and it had black crap all over it I used polishing compound to remove it and it was smooth with only a few minor groves.. it's prob wise to remove it and have it machined. if you don't you may get some minor clutch chatter or your new clutch disk won't last as long..
Matt
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