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It seems as though most people use the same one R-Spec. My questions are
-Is there one that costs more that has more options
-less with less options
-more than one reliable brand
-a distributor in the US that is reasonably priced
-would you recommend against buying a used unit from the classifieds
example "R-Spec Air Ride Controller with Harness for 01-03 LS; Like New $500 Shipped"
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