I also run the Toomey 2:1 UNI filter with an outerwear.
I ride in lots of conditions, primarily sand though, MX soon. :twisted:
I chose the 2:1 over the K&N clamp-ons because I was sick of replacing outerwears on the K&Ns & cleaning them all the time! I never had a problem with the K&N's filtering, but I had to clean them a lot more than I do my Uni filter on the 2:1 setup, which filters just as good/if not better in some conditions. I noticed no change in power when I went to the 2:1, nor did I have to re-jet. I would recommend the 2:1 setup to anyone, mainly because of the lessened hassle factor, the 2:1 is a lot more durable & easier to maintain, and I am still using the outerwear that came with it! :wink:
My side-shee has a single 34pwk(pretty sure NEway) carb with a K&N and outerwear....will probably stay that way. :?