On every bike i had it was standard to change the original filter at the first service for a K&N.
The only reason is that i ride 15 to 20k km a year and this is on the long term cheaper. I also always have a cleaning kit at home so i can clean it whenever i feel necessary or have the time without having to get a new filter first.
Everybody always thinking about power/performance but why?
With the horsepower and torque most bikes have nowadays it's only useable as small talk at the bar. Most people cannot handle the standard power leave them riding around 50 to 70% of the power and people who can handle the full power still don't use it and if they use it they're riding on a track or become donors real soon.
Here in the Netherlands a K&N pays itself back for the most bikes at about the third change and for de CT i already saved money the first time because it was cheaper than the OEM
