Just to clear a few things up. I had a STS Camaro Z28/SS kit I was going to put on my mercedes and the STS kit uses a very well thought out and engineered oil return. The oil comes from the engine, in this case it would come from the auxilary hole in the oil filter assembly. The oil returns via a electric scavenge pump exactly like the one RS-R makes and deposits into the valve cover oil cap. The pump can pull and or push oil, up or down, up to 6 feet and probably 50+ feet on flat surfaces. The pump it self has an alarm system to warn of a pump failure or overload. I sold the kit to a friend with a 04 GTO and he put a T70 masterpower turbo in the rear. He runs no intercooler but still sees stock air intake temperatures due to the nearly 10 feet of intake pipe. Also since the turbo is correctly sized for the motor it is always on the brink of boost and lag is non existent. The car makes almost 500 to its backwheels and he has yet to experience a problem. The car is a daily driver and is lowered but the turbo doesnt have so much as a scuff on it. It is tucked up into where the rear muffler is and is clearly out of the way. The scavenge pump is located in his trunk and is covered over by a pair of amps. The pump has no problem pulling up the oil and pushing it all the way back to his oil cap on his valve cover. The only draw back is minor: you will need a turbo timer set for around 60 seconds because if you dont a small amount of oil will pool around the turbo drain and you will get a little bit of oil burn smoke on start up.
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