I just got finished running a few ounces of water/acetone/SI-1 through a vacuum hose in my car. I had beaten on the car hard for the previous 15 minutes. I stopped the car, hooked up the hose, and sucked down half a glass spaghetti jar of the mix(2 oz acetone, 1 oz SI-1, and the rest water. After the halfway point I pulled the hose out and buttoned it up. Intake manifold was cool to the touch. Then I took her out for a good flogging. Usually, anything past half throttle is useless because of the audible pinging. Beat on it pretty hard, and no noises. I will take it up a big hill tomorrow for church, and I will see how she does.