I know what your mechanic is trying to say-but he is refering to intake tract runners tuned for a specific manifold-which we really don't have.
We have an elephant trunk which has several key choke points and forced to breath hot engine and radiator air.
I've gone through every stage of K&N-and trust me when I tell you-adding a K&N under the seat is worthless, gives no noticible power (and on a bike, you should feel at least 2 HP somewhere in the curve.
Also, adding the cone to the inake tract sammiched under the tank doesn't yield much better results-but it is a start-so if you want to remain conservative and your T dealership happy, that may be the route for you.
Hope this helps 8)