I basically built my own silencer kit, with parts from Chem-X.com. I just didn't need another gallon of anything at the time so I ordered the ST-160, ST-75 and a splice kit separately. I installed it all right onto my rolling hot water pressure washer, 2500PSI@3GPM. The foam quality isn't what you'd get out of a foam cannon, but Chem-X has been clear about that, at least in their videos, so I knew what to expect out my machine size. Still, I wish I could get it a little thicker- I might buy another dosing nozzle and drill it out to be in the middle of the 0.7 and 1.0 mm nozzles (1% and 2.5% respectively) to try to get it closer to 1.25-1.5% soap.
However stars and stripes doesn't really care about foam quality in my, albeit limited, experience. So long as they mix on the surface they get great results and my truck is 95% of the way to clean without touching it. This kit cuts down on the time it takes me to mix foam cannons. Especially with a trailer on I needed 2 or 3 full foam cannons of each part to get the truck and trailer all covered. I don't need to worry about that anymore. Now all I'm left wanting is a real wash bay with heat and a boom!
I also did a quick test to see if I could still use a regular foam cannon with this for other chemicals like snake oil, and it appears I can do so without needing to bypass the ST-160. That way I don't need to purge the lines or swap out the jugs.
I mounted both jugs with a custom sheetmetal pan I had my uncle bend up for me, but I've attached the plans so anyone who is looking to replicate it can do it.