Ok, after looking at a Gen3 installed with a "snug" fit, I still think a larger opening with a bracket is the way to go.
I'd prefer not to have it rub at the radiator support or flex at the relatively narrow silicon couplers. In my opinion, I would be reluctant to have metal to metal contact especially with everyone explaining that the hole needs to be cut "perfectly" for it to come out "right".
At that point, it's probably less time consuming for the shop to simply cut an oversize hole, fabricate a simple bracket and use an existing mounting point in the engine bay to bolt the brackets down. It will probably also minimize the possibility of scratching the chrome pipes while sliding them through the hole like what you might have with a "snug" fit, especially if you're making adjustments while you fit everything.
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Must resist...
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