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I haven't done anything to change mine yet, one of these days I'll do the upper block, I wouldn't worry about trying to get any extra air until I see water temp go up, since we have a digital water temp display I'd just watch that.
I've though of extending the existing air dam down a few more inches but haven't yet, I'd have to take it off in the winter. And it's so far back I'm not sure it would help much.
The engine bay from below is wide open so a belly plan might help.
I wouldn't mind lowering it, but don't want to loose any snow clearance. Maybe that's an option for you. Doubt it would save enough to cover parts and alignment.
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