After a very short in town ride - my initial reactions. My Tenere has had Leo Vince pipes on for some time. Last week I installed the Kev mod, O2 (old version) DNA filter stage 2 and the DNA cover (well actually huge gaping hole).
Bike now actually runs under 3000 revs. My bike has changed from a wild animal to a very civilised putt-around quietly in town (probably because of the O2). Not sure about the power increase because I tended to rev her like a two stroke before (because of the below 3000 revs fluctuation). The Leo Vince pipes made a huge difference in my opinion. I am also considering putting the snorkel back after my off road experience in very very dusty conditions last weekend. The stock filter was perfect after this and not a speck of dust inside. Not sure the DNA cover was quite made for serious off road, but maybe I'm just too cautious.

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2010 XT660Z Blue, Exan can, UFO high front fender, SW Motech baseplate, heated grips, 12v point, Kevs Fuel & O2 mod, DNA Stage 2 Filter and cover, Givi tall screen, Mefo mfe 99s, Kevs throttle mod, TT high seat and 'compass'

Hi Jacque, don't forget the throttle mod. ...it really enhances what you have already done. Steve