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Looking at the TRD lowering springs, they are linear in the front and progressive in the rear. I've never seen that, and it seems like it would upset the chassis. Does anyone have any first hand experience with them?
As for the UEL, how hard is the install process? I'm fairly capable and have good jack stands and a heated garage with air tools. Any down side to going UEL? I am guessing a slight drop in mpg, and of course risking powertrain warranty work denial.
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