I've got a Stage III 20V 200TQ. I would like to shift to a K&N air filter. It would appear there are two options. First to replace the stock "pad" type in the stock housing with the 33-2029 K&N. Second to actually do some mods on the intake box/hose and put in one of the "conical" K&N types. Anyone have any BTDT experience? TIA. Mike