Hey though I do not own a r15, but i know that the stock filter is good.....no need to change it....if you change the filter...it would harm the engine.....(as r15 is a ECU controlled bike, the ECU cannot cope with the extra air coming, so the performance can detoriate or the engine may get harmed....if you want sound then go for the dagrex exhaust by yamaha..... )....
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