I need to measure mine again but if I have 4" I'd say that's being generous. I have to use a low profile jack to get under mine.
Speed bumps and things like that aren't a problem with the crossmember. That's because the crossmember is pretty much aligned with the wheel track. Uneven roads with a high crown are definitely a problem, and the other issue is that if your crossmember is that low, the rest of your car is probably pretty low also. And, what about your oil pan. I just changed to a different oil pan to gain about 1/2" clearance as my previous pan got pretty beat up at the rear edge last year. My header flanges (Dougs headers, so they're about as good as you can get for fitment) are the lowest point, and I'm using 3" oval exhaust to help out.
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