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i had dual mechanical vacuum actuated valves (custom exhaust) in my MKIV VW R32 which
had an aftermarket HPA turbo system. it held up fine from the heat pm me with your email
and ill shoot you over some pictures of the valves if you're interested. i want to say they
are 2.25 and lambo has the same "flapper" but in a 2.5" variation.
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