stock airbox/stock airfilter

my used 03 busa came with a k&n air filter already in the bike, i prefer stock air filters and when i slipped the oem filter in its place it didnt sit all the way i see two foam gaskets 1 on top of the airbox and 1 down inside on the bottom of the airbox. Do k&n filters use extra foam gaskets? the stock filter has a foam gasket already on the base of the filter and is grooved on the lid so that the lip on the air box will slip in it. So i went ahead & peeled the foam gaskets off the airbox & the filter fits good, i just want 2 make sure i didnt skrew up by pulling the foam off the airbox.

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