Codiddy and fjc, here's the unit I bought:
3000 PSI 2.8 GPM Gas Pressure Washer
I apply the foam with the unit at max pressure. I turn it down quite a ways when I use the rinsing tip, though. No use in peeling the decals off my car. : P
And fjc, thanks for the info on the CG order time. Mine was still "Processing" this morning. : /
I did look at the Karcher foam attachment, and it appears to be very cheaply made (like most things Karcher), and I also was able to find a few youtube videos of it. It doesn't make foam like mine does, but it is a lot cheaper. Unfortunately, you would have to find a threaded female to quick-twist type adapter to use my unit with a Karcher quick-twist style pressure gun. Autobrite in the UK does make them, but holy cow, I bet the shipping would be huge. I think those people with Karcher style quick twist guns should probably wait to see how Justin's model comes out instead of purchasing one like mine and trying to find an adapter for it. I think that Karcher does make the kind of adapter you'd need, but I'd sure opt for an all-brass solution (like what Justin is talking about).
Oh, and fjc... if the price of the John Deere washer scares you (darn near put me on the floor... took me weeks to get the courage up to actually buy the thing), Lowes carries some other gas powered washers that are darn near as good as the JD, but for alot less money. They carry one that still has the Honda engine, but uses an axial flow pump instead of the triplex piston type pump JD uses. All the other components appear to be exactly the same as the JD unit. The price is about 400 bucks less, if I remember right.
I've been spending about 30 bucks a week at the local touchless car wash. That's how I'm justifying spending this much coin on a washing setup. My dual filter water softener setup should be here in two days. : )
Thanks for the interest, everyone! I'll update this thread with more videos as I get more soap. If anyone would like to see any particular soap used, let me know and I'll see what I can do.