• You could call a local indy to see what they'd charge. That will give you an idea.

    If for whatever reason you don't want to do that have a look on some forums to see how people have diy'd it. That will give you a gauge of complexity, which points you to cost.

    It might be straight forward. But at a guess you'd need to fuck about with the switch gear, electrics and remove/refit some interior shit. Then do all the pressurising etc.

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