balaton:
Engine intake air enters through the openings in the transmission cowl and travels over the xsmn and down the T/R driveshaft "tunnel" where it enters each engine compressor through cutouts in the firewalls.
The aircraft Siloe refers to has a factory particle separator mounted in the engine cowl door. The original air path by the T/R D/S is blocked with panels and all air enters the engine compressor through the inlets door inlets.
W1