The K&N filters work really well, and give the intake
induction sound a really sharp snarl above 4,500 rpm.
I've heard it described as "sounding like ripping canvas".
This high-frequency component really enrichens (IMHO) the sound
of the exhaust which is predominantly lower frequencies.
However, you will have to richen the mixture; the K&Ns flow
a lot more air than the paper-element filters. This simple mod
alone will enable a healthy motor to pull cleanly all the way
to 6,000 rpm.
Cheers,
Shane Ingate
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