I had gone to the Yamaha authorized service center yesterday and saw a person fitting Two air filters (Stock + K&N inside) to his R15.
Came to know that the person was two time champion at a national level racing event. So I was just wondering why would he put 2 filters in his bike.
Any PROS n CONS of this modification?


whats a 2 time national level champion doing at an authorized service station?? I always thought that they belong to the the breed which says 'heck with the authorized service center'.

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