So I just got my GReddy oil catch can in today, and found to my dismay that the tubing that comes with it is way too big to fit the nipples from the oil to the intake. I had read the properly sized can for the RX-8 was the 15MM, but the hose is enormous... is there an adapter that I need or did I get the wrong can? The quality looks good, but I just don't know how I should connect the stupid thing to the car if the connectors and hoses are way too large?

 

did you ever figure out what size? Im having the same problem.