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Join Date: Nov 2007
Location: Chandler, Arizona
The reed valve setup IS an emissions device. It is designed to inject air into the exhaust, to assist in burning the unburned gas that comes out of the combustion chamber. And it does do that. But doing that is not a good idea. It causes the exhaust to run hot, and also causes backfiring. I got rid of mine back when my bike was almost new. I never did get "coasters", I just used black rubber caps made to block off heater hose connections on cars. They were a perfect fit. After you have removed the 3 way valve and all the hoses, there will be a hole in the airbox that will need to be plugged.
In addition to that, I had a CA model, with an evap system, and also removed all of that. By the time I was done, I had a 5 gallon bucket full of junk.
I recommend keeping the "ears" if you want the best filters. If you decide to do the "earshave", the Uni filters should be a lot better than the K&Ns. My opinion of K&N filters is so bad I'm not even going to post it on here. I'll get yelled at for using profanity.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike