[CJD Automotive]

If the intended applications is really only street and autoX, then Wegner is probably correct that 2 scavenge sections is enough. If you were to get into extended boost events, (straight aways on track), then more stages would be helpful to keep the crankcase pressure close to 0.

A Daily 5 stage can pull the crank case to over 20" of vacuum. That's too much. The 3 stage is probably considerably less, which might be another reason they are recommending it. Aside from the front and rear crank seals needing to be for a dry sump application, you'll need a vacuum regulator on the crank case. Peterson sells these. They allow you set the max vacuum pressure. You should also consider a positive pressure blow off. Peterson sells these as well. If the crank case pressure goes over a preset pressure, it opens up to relieve it. These have a breather on them, but can be plumbed to a catch can or back to the tank.

The other thing to consider, it it's really recommended to have piston oilers on a street/track car. The dry sump pump pulls the crank case into a vacuum, sucking out not just the oil, but all the oil vapor mist. This oil mist is pretty critical to cylinder wall/wrist pin lubrication. The jet allows the oil to lube these areas continuously while still maintaining a negative pressure.