R&G got back to me and this is what he said
Hi
This will be fine on a Micron exhaust. If its a round one then go for the round and if its oval then go for the oval - they are made to fit the shape as appropriate and they tighten around the can with a large jubilee type clip. No modifications required!
Hope this helps.
Best regards
The R&G Racing Team
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So yeah awesome =).