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From what I've read, roadster will have less drone and buzz since the exhaust sound doesn't resonate within the cabin. Seems logical but can't say for sure since I don't have both to compare.
The Euro header has no cats; however, the S-pipe cats are more restrictive vs the NA ones. For the most unrestricted OE setup, Euro header with NA s-pipe is probably the best. I know this doesn't answer your question for sound but just my 2 cents when you're looking.
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