Every now and then I get to brag about my Vacuum Operated Exhaust (VOE) mufflers I built (and am still building). I just got done with six pair for Pontiacs and I test them on my '69 340 Barracuda 340-S. While my set was off for testing these others, I shot a few photos of them to share.
These use a 4" diameter vacuum actuator, originally found on GM heat and AC systems. With an actuator this big, you can generate a lot of puling force, which allows you to use a strong spring to hold the...
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These use a 4" diameter vacuum actuator, originally found on GM heat and AC systems. With an actuator this big, you can generate a lot of puling force, which allows you to use a strong spring to hold the...
Read more
