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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.