I've had the original Suplex (now SSL) fitted for some years now & you can alter the ride height when you fit the kit - it is supplied with a spacer & instructions of different positions within the setup to give different ride heights
But you cannot (well can, but shouldn't) alter the ride height once its all set up as you will preload the rebound springs and upset the ride
Personally I gained a very useful extra clearance on the Roadster sump & lighter steering
Be careful when changing he ride height that You do not induce "Bump Steer" because the track rods being sloped one way other the other too far. I had to move the track rod from the bottom to the top. There are a couple of ways to do this. The safest way is to have Peter Mulberry do it for You.
