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I recently installed the Steeda 22.5mm solid rear bar, with poly bushings and new endlinks. If your bar is hollow, you should be able to see the seam at the end of the bar from when they pressed the hollow tube flat for the endling attachment holes.
The oem rear bar was initially 18mm for wagons & hatches, and 19mm for sedans. Now Mazda only stocks 19mm for all applications. I had these results for my hatch with an 18mm bar:
1- much better cornering with minimal understeer, much more neutral, huge change. But like Canyon Racer, I've done 1000's of miles of track days, and won 2 local autox seasons out of 3 I competed in. So I know how to test for changes in handling.
2- holds car much flatter in the corners.
3- lost the highway wander in cross winds.
Any sold rear bar this size is an excellent addition. Not sure, but Progress made a 24mm rear only, and Racing Beat makes the biggest bars which should only be installed as a pair.
You know the bar is installed right by looking at the lever arms. They have a vertical bow, with the highest point at the middle of the arm.
04 6S atx hatch
93 RX-7, 75 Trident
Last edited by KevinK2; 03-24-2013 at 01:02 PM.