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      10-05-2011, 08:29 PM   #9
tonymac1
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Drives: 2021 X5 40i, 2011 E90 M3
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Quote:
Originally Posted by akh23456 View Post
all it does it place your 02 sensors further down the hfc pipe. They go right in where your plugs are now.
Ok, i was thinking if it's me that making the wrong choice, was thinking about getting challenge xpipe before.
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