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Pressurization comes both the front and rear turbos on the P337. Simply described, on the supply side, the air from the turbos goes through a heat exchanger and then into a plenum where it is distributed to the cabin. On the exhaust side, pressure is controlled by an outflow valve backed up by a pressure relief valve.
The front and rear system air have a slightly different routing. The front system air also passes through the janitrol heater manifold (which is why you can't remove the heater as I have seen discussed. I have yet to use the heater except when checking it).
You can isolate the front or rear systems by pulling the associated dump valve and operate on only one system. So in case of engine failure above high terrain, pressurization is retained although you might see a slight reduction in the differential. (on the Adams A500, pressurization was driven only by the rear turbo so if that system or engine failed, pressurization was lost). So good redundancy on the P337.
Richard
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