Oh.....and, I've found that with the Koni Sport damping, spring rates similar to what I picked and V8 torque -- you may find you don't need a rear sway bar at all. I'd use a big one on the front (25mm) and try it with no rear bar at all before deciding. In any event, probably won't need anything bigger than one of the stock rear 4 cylinder bars. I elected to completely remove the rear bar.
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82 242 5.0L; '10 Cayman S; '15 Honda Fit