I think the better question to ask is if anyone else has a Boost gauge?
Are you measuring these readings at full throttle under full load? My Turbo cars have always performed better in colder weather.
2011 1M, Valencia Orange, All options.
August 8th ED (#293 of 739 or 740)
88 E30 M3 100% OEM 73K Miles
02 E39 M5 Le Mans Blue 50K Miles
06 E46 M3 ZCP 58K Miles