to be honest, I have no idea about the 28mm sway bar swap, maybe someone else on here might know. additionally, I am pretty sure that the current price is not increased like you may be thinking b/c of machining it out to 29mm. The original price was about that to begin with. That price includes the air ram assembly with air line and switch valve along with shipping. without the air ram, it was approx half as much money. I am going to keep my 29mm sway bar and just get mine machined out to 29mm. keep me posted on what you guys want to do. I will let frank know as soon as you tell me for sure.