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      03-23-2012, 10:17 AM   #20
TahoeM3
First Lieutenant
13

 
Drives: GTR, X5 50i Dinan, & E93 M3
Join Date: Apr 2006
Location: South Florida


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Quote:
Originally Posted by m 135 View Post
I know the air-filters are placed at the rear on the 50i,which also makes them hard to change,where as the M versions are toward the front,making it easy to get to if you want after market filters.

I wonder if the different location on the 50i is a negative for air-flow like you mentioned
Could be...I need to look under the hood and see if there's any restriction point. I remember the X5M having two big air boxes right up front.

In the past I had a 987 Boxster S. The air intake was on the side, and it had a restrictor plate that literally had a gap a finger-width wide allowing air in. I removed it and gained an easy 15 hp up top. Not saying there is something similar here, but manufacturers have been known to do this kind of thing.
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2011 Nissan GTR Red/black - HP Logic tune/midpipe
2012 BMW X5 50i M-sport Dinan stage 1 Space gray/black
2011 BMW M3 convertible Jerez black/beige
2015 BMW M4 Alpine white/black
Gone but not forgotten: '12 X5M, '07 AM SuperVantage, '05 Boxster S, '01 BMW M3,...