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Exhaust Valve
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The starting point, Vauxhall Omega V6 2.5 throttle body, nice and cheap on ebay for £5 !
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After chopping the throttle body in half with a hack saw and removing excess bits with an angle grinder it was time to turn it down on the lathe.
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This is how it will work in the exhaust.
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Here's one half down and the other half still with the rest of the metal on it.
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Now both are cut out on the lathe.
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Test fit with valves closed.
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Valve open!
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Hold drilled through exhaust tip, throttle body metal fitted in test fitted.