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wouldn't a butterfly intake cutoff also function as well for engine braking as an exhaust brake? works OK for gas engines depending on compressions ratio. don't know if an exhaust brake would be able to shut down the engine but it should atleast limit the rpm to safe levels. (don't know how...

CO2 not sure the duration of a CO2 blast int he intake required to smother it, but you could easily rig up a 20oz or more CO2 tank with an electronic nitrous purge valve that would pump the co2 into the intake. would run about 100$ in brand new parts. or much much less if you get used parts...