Update: I've driven the car a few more times and am very pleased with the sound. If I did it again, or opened the muffler back up, I'd probably go just a bit louder with a 3rd 1" hole, but I'm satisfied for now and worry that too much more would be obnoxious.
As is, it's definitely tasteful and sounds more like I feel a Porsche should sound.
Just do it!
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