imo cone filtes arent shit, they dont work well on a rr due to minimal air flow but out on the open road the air flow is more than sufficant, cold air is being pushed into the engine bay and hot air is escaping through the bonnet vents, best ducting to use is a mk3/4 heater hose as they are large diamiter and long enough to zip tie to the anti roll bar and go right up to the filter