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I noticed that the rear anti roll bar on my 07 Base Cayman measured at 19mm and yet the one still on my Boxster S (still parting out) was 20mm. I didn't expect it to be as noticable a change as what it has been but on my drive to work this morning it's noticably flatter on the highway off ramp and thru roundabouts. No noticable change to the ride quality. Definitely a worthwhile upgrade. I reused the bushings from the Boxster but checked the part numbers on the aluminum bracket (a 996 part number) and they are the same for both bars.