No experience with aftermarket vacuum reservoirs, but it isn't rocket science - all it is is a pressure vessel that can handle -14.7 psi with a check valve on the port going to your engine so that air can only flow out. You could make one easily enough if you had an appropriate pressure vessel. I have a thought on what I'd use, but can't really recommend it to the great wide internet due to safety concerns with the residual flammable contents of said pressure vessel. Maybe $35 for the Jegs aftermarket option isn't so bad lol
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