You can get 17 & 18/275's with a 5.5" backspace and you will be fine as long as you don't lower the car too much. More an issue up front than rear. With a 5.5" back space you will rub frame when steering loc-to-loc but not enough to be an issue. If you lower the car too much in the front with 5.5" backspace you will rub upper/outer front fender wells. Don't remember what the safe height is but I'm pretty sure if you drop only 2" all the way around you should be fine.
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Gaetano Cosentino
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