I believe you might be referring to Stage 2, map 2. Map 1 is for stock vehicles, as far as I know. Map 2 is for those with an aftermarket downpipe.
See here:
http://www.n54tech.com/forums/showthread.php?t=18588
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Quote:
Map 0: Stock performance, JB4 off
Map 1: Peak boost 12.5psi, suitable for stock and mildly modified cars on pump gas
Map 2: Peak boost 14.0psi, suggested for those using a downpipe and 93 octane (USA) or higher fuels
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