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      09-14-2010, 09:22 AM   #24
BT M3
Second Lieutenant
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Drives: 2010 M3
Join Date: May 2010
Location: MA

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From a previous custom tune on stock x-pipe with rear section I made 366whp. Just by removing the primary cats from the stock X the baseline was 390whp. After slight dyno tuning of the same file to suit the primary cat afr (it went slightly rich) the car made 398whp. It was the most significant mod to date.
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