Patera1889 & BillD
My .02, the complete oiler setup is recommended most definitely for prolonged racing, ie endurance. For track days and around town, street racing the benefit of oiling the gears would be minimal. Although, simply oiling the ring gear alone is a good idea regardless, due to the fact that when the trans is inverted the ring gear is not 'bathing' in oil as it is when not inverted. Also, as Mike said, the cooler is a good idea as well.
Along with Patrick Motorsports there is guy in Lake Havasu City that has a Porsche trans shop named California MotorSports. His name is Bobby Hart @ 928-855-5755. He also does the rebuilds and oiler setups along with shorten nose pieces and cable shift units.