DNA Filters only make the ride better and REDUCE surging at lower speeds, well worth the time and $ you won't regret it..
On the next oil change I will be checking the ball, spring & seal that holds the oil in the gallery as mentioned in another of Kev's posts as when i did the last oil filter change last I thought there was a bit of oil on each screw also... don't think the oil gallery would have much to do with that but will check it out anyway
Kev's post re oil gallery -
http://www.xt660.com/showthread.php?t=9392&page=2