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i've posted lots of info on this topic on this forum in the past. the sc is an eaton blower. eaton doesn't sell direct to consumer, however, so a company called magnusson buys them in bulk, adds some improvements and resells to kit makers.
the 'trick' tpc uses to run rich in order to keep temps down is as old as the hills and not attributable to tpc. typically used in super high boost applications, where the increase in boost more than offsets the inefficiencies of running outside the best air/fuel ratio, this approach is a power suck in the low-boost, high compression boxster application.
tpc made this kit before tuners had broken the boxster ecu. in order to ensure proper fuel delivery in an application where the volume of air supplied was well outside the ability of the ecu to adapt, tpc ran a piggyback. piggybacks, if used properly, have the ability to interact with and intercept a great many of the ecu functions. unfortunately, when used by tpc, all they did was intercept the rpm signal and use high rpm as a trigger to open a 7th fuel injector added to the intake as part of the kit. not tuning at it's best; efficient/effective fuel distribution is compromised, you depend on the knock sensors way too much, ability of the ecu to adjust timing is ushed to the limit, etc.
the original tpc kit was designed for a 2.5, and only shoehorned into a 2.7/2.9/3.2. to make it fit piping diameters are compromised and you ahve to use a 2.5 exhaust. brad roberts also advises that the orientation of the sc in the tpc install starves the sc bearings of oil resulting in increased maintenance. also, the sc is located right by the exhaust; poor choice in an install where heat management is already such a big issue (no intercooler on the tpc sc kits; those only got introduced when porsche added the third radiator - again, however, third radiator is there to keep the bigger engines cool, yet tpc repurposes it as an air/water intercooler).
original tpc sc kits reattach the aos to before the sc. good idea in that vacuum is maintained, bad idea in that all that oil and crap is passing through the sc. later tpc kits just vent the aos to a catch can - bad for crankcase vacuum, bad for the track when it overflows.
i think you can do forced induction with these engines, you just have to do it properly. unfortunately, a bunch of hack kits quick to the market, and resultant engine failures, have established the internet myth that you can't do fi on these engines. check out turbokraft - they seem to be building a really solid turbo kit.
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