Back in the days when i had road going two stroke bikes (men were men & sheep were worried) the easiest tuning mod was to fit K&N filters with an increase in the main jet to take advantage of the extra air flow through the engine the filters gave you. If you didn't check/change the jetting you ran the risk of putting a hole in a piston.walsi said:I know from the motorcycle side that K&N filters arn't allowed to flow any more air than standard filters, i would think the only advatage would be by fitting an induction kit and doing away with the air box but you then have the issue of noise. I stand to be corrected on this but i know they don't make any difference with bikes and you need to look at different manufactuers if you want increased air flow. If only Carlsberg made air filtetrs
The increase was minimal but the filter(s) were reusable & that was probably the main benefit, you never had to replace them, just clean & re-oil every service interval.