I agree with Sonny..I installed Ramair on my previous Rocket and thought it was great...when you install it, you remove the air filter under the seat which leaves a good storage area for rain wear or whatever. At the bottom of that compartment is a small breather hole which runs down thru a rubber hose and into the crankcase breather. The crankcase would have "Breathed" into the air filter housing right?...so now its obsolete and you need to put the small filter, which comes with the ramair, over the crankcase breather pipe. If you leave it the way it is and that small hole in the filter housing under the seat gets blocked with whatever, then the crankcase cannot breath and that will cause problems..