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They're big with the Mustang crowd, not sure it did anything, but it looks cool.
It's 1 of those things that make sense in theory, but hard to really quantify with results.



I just love and hate posts like this...to the OP please ignore this opinion while i share some facts.

Oil in the a/f mixture causes pinging. Engines under load produce oil vapor that gets pulled thru the pcv into the a/f mixture.

The devices the horse crowd are using work and work well as we ran the omg "mustang part" on 2 mopars that ran numerous laps on the road course.
Besides collecting oil while running fast they also collect oil under normal driving. Every car should have one. I would post pics of the device but the pics are on a different computer and won't change a thing on here....