just take a look over on supermoto junkie and read about the SM610 owners that have stuck K@N cone filters on their bike after removing the entire air box.
I did a search at SMJ found this thread: http://www.supermotojunkie.com/show...emove-the-airbox-replace-with-clamp-on-filter
K&N will do just that. Not a lot of people do it cause its a pain in the ass, you need to clean the filter ever couple of days and they are not that sound when it comes to stopping debris from getting sucked into your engine,as well as the water issues that arise. I assure you noise is not the issue race teams(and beauties) do this sort of thing all the time.
Yeah, it's not just about weight. Primary and secondary length and diameter, as well as bend geometry near the port and conductive properties of the material play a role in performance numbers. Not nearly as significant as say an inline 4 engine, but there is a difference nonetheless. But the ~17lbs probably makes more of a noticeable difference than the header geometry...
hp and torque are much better between 3000 and 3500 rpm which allows easy cruising with the stock TE gearing at 60 to 65 mph where the bike with the stock system feels gutless. I'll try to get better photos when I get time..
Everything is great, Fast1 is correct! Header design does make a difference and I have tried many. By going with the single you are eliminating a lot of tubing and weight. It's not a huge gain in power over a nice set of duals but it is something, and after all we are only dealing with one cylinder.
