If you're worried about the water then why not fit a map switch to your PCV and load two maps; one for stage 1 filter and one for the stage 2. If you know you're going somewhere where you are likely to hit deep water then you can fit the stock cover, which doesn't take that long, before you go out. Or maybe even get a blank stainless cover made up (like the ones aliwakeskate makes but without the holes) which you can quickly screw over the top of the stage 2 cover? Flick of a switch and you'll be running the correct map.

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