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      10-08-2011, 10:06 PM   #5
My X5d tows my spec miata to the track.

Drives: 2010 X5 35d
Join Date: Sep 2009
Location: USA

iTrader: (0)

Here is the virtual dyno comparison of a 3rd gear run before and after the exhaust install. The logs follow.

That's a pretty sizeable gain - 35 whp. Looking at the logs you'll see IAT differences of about 10-12 deg. That will negate some of the gains as cooler temps give more power but at close to the 100 deg mark I'm not sure it's that big of a deal. I'm not necessarily saying I gained 35 whp but the car feels quicker.

There is a big throttle closure with the new exhaust. This was literally on the drive home so there was no adaptation. I never felt it - as demonstrated by the dyno. My timing values are dead even.