SPC don't suck but they are difficult to align, a good bump will knock the alignment off and the rubber bushings deteriorate pretty quick under heavy use..........OK they suck lol. I wouldn't approve them for track use but for z's with crazy offset wheels needing that camber they aren't bad. Its a shame that SPL is taking forever to release their uppers. The Doran arms work well since they also use a shim design that won't knock it off alignment but you don't have as much adjustment for front caster.
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