Thanks Leon. That would explain where the 8 HP went on my last dyno run up top, even though I gained 11 hp in the middle after the RapidBike install. I've got at least that many miles on my MWR HE and sadly haven't cleaned it yet.
Do you have the cleaning kit or how are you cleaning it?
Wow Ljuice that filter looks really dirty. At least you're using it! I was thinking about getting one of these filters for my bike as well. I already have the MWR cleaning fluid and filter oil from a previous MWR filter that I had for one of my older bikes.