while doing my winter maintenance on my bike, i discovered the previous owner had done some upgrades. one of which is a set of k&n filters. i know these actually hurt performance so im gonna get some stock filters. i had read someone said to order 2 right filters so there is no foam insert since i did the flapper mod. will it make that much of a difference? i found a set of oem filters for $20 for left and right to get 2 rights i have to go to the stealership if i want em local. would it be beneficial to order the 2 rights?