[antaircooled]

There is a guy here in NZ who runs a 3.8RSR engine with 390HP and 337ft/lbs torque through a modified 915 gearbox. He has won the Porsche championship in 05/06 and runner up 06/07 so it is possible. He is an engineer and machined new gears etc himself and installed them in a late 915/67 with the OEM cooler and LSD. He doesn't seem to have broken anything over those two seasons of racing.