After digging around in some of the forums out there, I found that this bike has it's air filter tucked away behind two sets of plastic, both fully covering the intake from debris. The bike breathes through a tiny snorkel in the air filter housing. At my previous bike, it was possible to take that snorkel out to give the bike more air.
By taking the inner cover out on the XMoto, the effect is the same. Since the outer cover does a great job in keeping debris and water out and the air filter is bolted in, there is still very little chance of anything entering the air filter housing.
According to a BMW tech in the ADVRider forums, removing this plastic part does not harm the bike at all. Just try to avoid riding full throttle for extended periods of time - which should not be a problem. If I would have wanted to do that, I would have bought myself a sport-tour machine.
The net/net effect? A nice grunt when opening the throttle and some added power/torque. There is a posting out there that shows some dyno details on this mod - when I find it, I will post it here.
**UPDATE**
From the ADVRiders forum:
Stock the G650XChallenge with 500 miles did 42.80 rwhp/ 37.09 lb torque
With OEM Paper filter and intermediate snorkel cover removed 43.80 rwhp/ 38.13lb
With Foam Filter and intermediate snorkel cover removed 44.78 rwhp/ 39.61lb
I guess for the XMoto it should be about the same.
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