bill67 wrote on 04/22/10 at 19:14:32:I've put k&n filter in cars and motorcycles and couldn't see any improvement in power or gas mileage.
Typically you won't unless you tune for it. Any upgrade requires tuning-car or bike (non computer). My trak ride picked up and revved quicker. Had to retune the carb a little. I took my XJ750 from 13.10 to 12.87 with 1 up on the main jet. opened up the airbox and went 12.80. took off the filter and went 12.83. installed a big K&N and went 12.76. Gutted the pipes and went 12.61. Removed the air box and ysed EMGO pods, 12.60. Switched to K&N pods and 12.53. Switched to a big K&N oval and went 12.50......next is a tuned 4/2-2/1 combo with a long collector and a huge muffler.
My Dad's 05 America picked up 5 HP at the rear wheel with a swith to BUB pipes and a shim on the needles. Added K&N filters for 2 more. Now the rear wheel HP is the same as the BHP at the motor, 66.
Ya can't feel 2hp, but you can feel the change in throttle respnse/carb 'attitude'.
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