Ideal for fitting a 6637 type air filter to an early '99 Ford 7.3 Powerstroke as a slight angle/rotation is required, but you need to lower the clamps a bit so as the outside diameter isn't exactly 4 inches but more like 3.95 or something like that. As long as you're careful with the clamps (so you don't strip the worm gear) or a slightly stronger clamp on the side of the filter, you'll be fine.
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