Patrick,
The OEM set up leaves the rear axle ½" lower than the front axle. NOT conducive to good handling.
The Exedra Max brings the rear axle level with the front axle. Better handling.
The 140 drops the front axle ½". Best handling.
On the Roadster, a 130 will further drop the front axle, faulting the ABS and reducing lean angle to dangerous levels in my experience. Handling, although quicker, will be dicey and things will dig into pavement if you are a twisty boy.