As a GM licensee I was able to request GM drawings when we (Waldron's Exhaust) were reproducing the VOE mufflers and control systems.
There was an engineering change to the under-dash Ram Air bracket that added 2 holes along the upper edge of the bracket. Those holes were added to allow the installation of a second mounting "tab" to allow the installation of the VOE switch on a Ram Air equipped car.
As I understand it, VOE was never offered with Ram Air because there was insufficient vacuum at idle to operate the actuators. BUT, the car in the "Humbler" commercial was equipped with Ram Air AND VOE controls on the under-dash bracket. It can be seen when the driver reached down to activate the VOE switch.
I installed a system on a RA IV car for an article written in High Performance Pontiac by Paul Zazarine. The muffler actuators could not fully open the bypass valves until the engine was operated off-idle for a few seconds.
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"Keep your stick on the ice...and your head up."
1910 Buick Model 19 Touring
1923 Cadillac 5 passenger coupe
1933 Pontiac 4 door sedan project
1933 Sport Coupe project
1968 GTO, 428, THM400, 2.73 posi cruiser
1969 Chevrolet C10 Fleetside, 350, THM400
1958 Buick Caballero 4dr hdtp wagon
2018 Ram 1500 to tow stuff
2024 Buick Encore GX
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