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The main reason we switched was the heat capacity of the graphite gaskets made by remflex versus the aluminum gaskets made by percy's. Over time (a year or 2) I noticed the percy's distorting at the exit of the downpipe to reduce the effectiveness of the seal it was making. The carbon graphite gaskets made by remflex should be good to over 2000degrees. I've tried percy's at the turbine exits on some turbos and they'd melt/distort very quickly in those appications. Of course aluminum melts at about 1300degrees so it was somewhat logical. In most applications (non-turbo or away from the turbo), the percy's would be better at being reused than the remflex which can come apart a little bit when being removed and reinstalled.
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