From what I understand you have to have that last sleeve to back out to run the ES.
What I would recommend is coating the tops of the solids w/ undercoating, then the washers/nuts on the bottom in an attempt to subdue some of the noise. I've done it on a couple cars and it seems to help the noise level (I've not done back to back on the same car to know for sure)
Later
"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut." - Albert Einstein
When was the last time you *really* did something with your Z to call yourself a Z enthusiast?