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      12-20-2012, 11:05 AM   #26
Drives: m3
Join Date: Oct 2012
Location: CA

Posts: 220
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Does anyone have experience hearing a test-pipe car vs a aftermraket x-pipe/HFC car?

Can't compare a fully catless xpipe because the test pipes keep hte secondary cats so the comparo would be between a x-pipe with HFC vs a test pipe car?
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