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Challenge Street mid + M performance catback. Anyone?
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02-02-2013, 11:50 PM
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kitw
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Drives: F91 M8, 991.2 GT3
Join Date: Jun 2007
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I've found that resonators do cut down on the rasp somewhat, but not completely. I really don't think removing the secondary cats is worth it, I think it's always better to remove the primaries with a $400 test pipe.
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