Has anyone else had any issues with their Air Filter cover? On My 04 Sportsman 400, When I sit in the middle of the seat it has a Nice quite exhaust tone during acceleration, However,If I stand up, or Move around on the seat the Exhaust tone suddenly gets Very Deep like its Choking off the Airflow, or perhaps even getting Very lean Suddenly. I can see 3 Areas on My Seat and Filter lid where the seat comes in contact with it, It doesnt seem to affect performance much, however It bothers me to no end.. I have checked and rechecked all clamps, lid, snorkle, etc.. and cant find any reasoning to this.. I know its NOT a vibration..
Any Ideas?

Ron
04 Sportsman 400
DynoJet
K & N
HeelClicker W/ White Primary
Magellan GPS