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i know in the miata's that the sound you're describing comes from worn bearings in the water pump and alternator, especially when the belt is either too loose or too tight. they can also come from the crank if the rotating assembly isn't balanced (using the stock crank pulley on the 1.6) and you stay high in the RPM range. factory redline is 7.2 (1.6) and after the LWFW a good amount of people will go 8k+ with cams and dual spring valves.
did you balance your whole rotating assembly before instilling the LWFW on the boxster? i read that installing a LWFW in place of a dual mass without a balance can lead to catastrophic engine failure due to the vibration negating effect of the dual mass fly wheel. also, since both the pressure plate and LWFW are not factory, it's safe to assume that the factory manual will not cover them. go by what the manufacturer recommends when installing their parts, as i would hope (hope being the main point here) that they did actual product testing on the applied parts with the vehicles they are selling them for. as some parts can be pretty universal, it could be possible that the manufacturers recommendations will not suit your set up.
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