According to Don you don't need a stabilizer and thats what the owners of the trucks that have it say. It makes the steering tight!.
Don's design looks awsome! I talked to him and he is a great guy. The only problem I see with the system is you must drill out the steering knuckles and pitman arm to install the kit. Its a problem if you ever want to change but IMO drilling will make it stonger. I would like to see two kits, one that you can drill out for big lifted trucks and a more mild no drilling kit for stocker trucks.
Erik