It reminds me of the old vent valve on MGBs and Spridgets back circa 1970.
Someone suggested that engine braking could harm the AOS, but the greatest use of engine braking is from long descents in the mountains. Jake said living in higher elevations causes few AOS problems so I think this would imply that severe engine braking shouldn't harm the AOS.
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Base 2000 986, beater 1996 Miata, 2011 Suzuki SX4 AWD
Feline mechanics Condoleezza and Dukie
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