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Dear allrounderco,
Hope you're well and stay so. I stood aside in the hope that someone - who had tackled this problem - would offer experience-based insights.
I don't have those. But it seems to me that a wider-bore catalytic converter than that factory-supplied is not likely to be a problem. Turbo engines' exhaust is at higher pressures than is exhaust from non-turbo engines. So, a wider-diameter exhaust pipe is needed to prevent back-pressure.
On a non-turbo engine, the wider exhaust pipe would do no harm. On your car, only the catalytic converter has a larger diameter than its input and output pipes. There's nothing that restricts the exhaust stream.
I don't know whether a catalytic converter for a turbo-equipped engine has a larger block of reactive material, than is found in a non-turbo catalytic converter. Catalytic converters are not meant to be opened - except for end-of-life recycling: there's no obvious way to ascertain the size of the reactive material block.
Even if the turbo-compatible catalytic converter has more reactive material than is found in a non-turbo-compatible unit, that can do no harm. The exhaust from a non-turbo-equipped engine will be a tad cleaner.
Hope this helps.
Yours faithfully,
Spook
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