i would not get a twin air after owning one. with their filters you use the stock metal cage in it. that cage is pretty restrictive. i would get a uni filter. the uni comes with a cage and it is not restrictive like the stock one. do not really expect a power gain. you might get something with the uni but it may not be noticable unless you are on a dyno.
2005 450r
*sold* 2001 400ex
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