1999 Pontiac Trans Am SLP Performance Parts Test - Trans Slam
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Note the dramatic size and obvious flow advantage over the stock Y-pipe and cats shown earlier. We reinstalled all four 02 sensors into the SLP headers and Y-pipe. A trade-off of losing some ground clearance (1-2 inches) was worth the significant gain of 22 rwhp. So far, we have yet to bottom out with the headers. View Related Article
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