I am considering it....
I may buy a K&N Airfilter, attach it to the intake tubing and see if it makes a difference. I may just do a test without the intake (BOX?) attached first and see what it does. I heard the mph increase, and the rpm's obviously will come up as well. Not sure about the noise, but a test should help me find out. I saw the Riva filter was like $249. or something! way too much for me! Rick