I ran 20mm H&R spacers on the OEM Rays with Swift springs a while back, and during full suspension compression, the tires would slightly rub on a plastic tab somewhere on the fender liners. I was concerned at first, but it wasn't really a big deal. Unless your car is super low, the air guides you mentioned won't come in contact with anything.
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2013 MB NISSAN 370Z SPORT
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