If its the same as the MC21 the no its not adjustable and yes you can get after market ones to fit Maxton ohlins hyperpro white power etc,they do cost though or you can get race tech internals change the spring and whilst its in bits get someone a good someone to remove the top bushing and weld in a spacer.You could also get someone to make a new linkage triangle but that will affect the leverage on the shock.Thats about it