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What Bolt On Mods Make Power!?!? E90 M3
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07-30-2012, 01:16 PM
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SflBimmer8484
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I suggest going with our drop in filter, cat-less xpipe and tune to start.
X-pipe alone is good for 20 whp.
Here is a dyno with filter,pulley,tune and rear section only. (stock X-pipe)
Appreciate
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