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I have an insulated box around my exhaust manifold, then run a vacuum hose to the intake. I have found (no A-B-A) that around 90-110*F I get the best economy. It gets "funky" above 125 degrees, and fuel economy drops below 80 degrees. On hot days/afternoons I leave the hose disconnected. In the mornings I have it connected. I have about $2.50 invested in the system. It would be nice to have a push/pull cable to connect/disconnect, or get something more thermostatically controlled.
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