[Darren69]

Gary makes a good point and I can't remember exactly what I did with the drain pipe on the airbox on my S4, but I think I just put the rubber cap back on after removing the pipework. The oil pipe was blanked off with a panel grommet and if your airbox isn't cut back too much at the front you shouldn't have an issue with water running off the tank straight into the airbox.

Currently I have a K&N filter on the crankcase breather direct which can be an issue, and ideally I want to extend it away from the crankcase as soon as I can find a suitable adapter piece to run some hose under the seat with the filter on the end, out of harms way.