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      02-14-2013, 11:05 AM   #3
onefast1
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Drives: 2009 135i
Join Date: Dec 2010
Location: Albuquerque, NM

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I really think it depends on what other mods you intend to have done. If you are simply running a tune with some DP's, intercooler, air intake. I don't think it really makes a difference.

If you are going to custom tune, run higher octane, change out the entire exhaust. Then I really do believe a true 3" or larger DP will yield additional gains.
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