It's not the BHP that will kill the box, its more than likely the torque. But you can map torque out to a degree which is likely how others have managed high BHP on a 5 speed along with a respectfull right foot and deep pockets in the knowledge if it kills the box it will just get another.
Remember having a classic with a 2.5 on a 5 speed, and as soon as it was mapped to just 1.1 bar and full torque it lunched the box the following day on the 3rd gear pull... But to be fair to Scott who mapped it, he marked my card and said you will strip third gear with the extra torque in the near future, but was a gamble I was prepared to take.
Best thing about a 2.5 is the torque and what makes for a quick road car so would personally prefer torque over BHP. 320 or 350 bhp you would struggle to notice a difference but a jump in say 50ft/lb in torque will feel notably more punchy and 'Feel' allot quicker.
Horses for courses, and it's always good to talk to a mapper before the process. But to be fair to commercial mappers they won't want to max things out on clients cars as they won't want customers cars breaking too often as it could reflect on them and there reputation even though its probably nothing to do with the map, and more because a car is stretched to its limits and on borrowed time.
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