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Start with the 93 map as you intend and if you get timing issues just pay the extra $50 bucks for the full map bundle and try the 91 map. It's pocket change for the extra maps, especially considering what's in your awesome garage :-)
I've done this on my OG N55. In Australia our 98 is probably a bit marginal for the 93 tune and to be honest, I can't fell any less power on the 91 version. Perhaps if I was to dyno it but on the street and track, it feels strong and smooth. And the timing logs are sweet on the 91 map (not so the 93) so I'm perfectly happy with it.
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