I would collect the parts as you can and then install them all at once. Not sure how different the truck would ride with two different types of shocks.
Good luck getting a lawyer to deal with this. And you don't necessarily need a watermark to claim ownership of the photograph, you're the owner when it gets uploaded. But all my shit gets hosted to Flickr and I hotlink to the forums.
Listening to the before/after clips, that little valve smooths out the grumble and pop produced by engine deacceleration. Just another tool to tune the exhaust, that's all.