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Old 01-30-2010, 07:22 AM
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madurodave madurodave is offline
BMW Enthusiast!
Location: NH
Join Date: Oct 2008
Posts: 5,669
Mein Auto: 2007 Z4+X3, 2006 530Xi
Originally Posted by Evlengr View Post
It sounds nice, but did it actually make a difference in response time?
My Z3 experience was the exhaust did not add a whole lot to the engine's power. The sound difference was incredible.

The main power benefits I found were the Dinan software upgrades which increased redline cutoff and altered the fuel curve. This, coupled with the cold air intake for more air flow, gave quite a boost to my Z3.

As far as the 2007 and up X3's, I suspect BMW has extracted most of the power already. It is probably not worth it to invest too much into perfromance upgrades for the X3. I think you would spend a lot for a very little gain. The only exception would be supercharging. This could give you up to a 60 hp boost for the $5k range.

My garage: 2013 BMW 550xi GT, 2007 BMW Z4 3.0si Manual, 2006 BMW 530xi

Retired: 2007 BMW X3, 1998 BMW Z3

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