I was on Fordparts.com and found weatherstripping hood front part# 16B990 its listed for$31.90 though about checking it out.
My issue is that the car sucks in dirty, salty water from the road and lightly sprays it across the engine bay. It isn't a flood by any means, but I don't like it and am not convinced that the gap is needed for engine cooling or other purpose.The gap is there for a reason. People stop complaining. It's how the car was designed. You don't see it on the non ST focus since they have a different front end.
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All I've done is lower the rubber stoppers as far as they'd go. I haven't tried modifying the latch assembly. I can live with this but I don't have to be thrilled about it. I definitely won't put in an aftermarket intake like I put in my last car. The only option would be something that retains the factory airbox for me as I would not trust an aftermarket intake with an open design to stay dry. I'm staying stock for the foreseeable future anyway. Maybe the RS will have a better seal.