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      12-13-2010, 09:05 PM   #7
Mindgame
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Drives: 09 135I
Join Date: Oct 2008
Location: McKinney, TX

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I'm have no official sources but I can only assume the extra power coming out of the "is" model and 1M model is an increase in boost, tuning if you will.

So if you run the same PnP setup with the same amount of boost (135 @ 14psi, 1M at 14psi) you will have the same HP between the two.

Of course, this is speculation.
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