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      11-09-2011, 08:14 PM   #83
First Lieutenant
Drives: E92 M3
Join Date: May 2011
Location: New England

Posts: 351
iTrader: (2)

The X pipes that make the best power merge at the beginning after primaries. RPi and Gintani. The stock style x's seem to make less when tested on our dyno in my experience.
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