Well, I installed my boost bolt last night and did a check with the new boost solenoid to see how it compared to the one on the truck. Both resulted in a vacuum reading at the actuator of about 19" Hg. So I left the stock one in place and took it for a drive with my 850 lb 4 wheeler in the box and a 3400 lb trailer on the back. It would still build boost as I was accelerating until it hit about 10 psi then would drop down to about 8 psi, which it appeared to hold. It appears to be working, but with the load I hooked up I did not get the engine temp up to about 200-210 like when I am pulling hard, so I will have to wait till next weekend when I take the camper on a trip to see if it actually works when under heavy towing.