The COBB Air/Oil Separator integrates into the Subaru crankcase ventilation system to capture oil vapors before they reach the intake. Its compact cast‑aluminum construction with a black powder‑coat finish provides durability while fitting within limited engine bay space. A 1‑liter internal reservoir offers ample capacity for extended high‑performance operation. Integrated ORB ports deliver separate oil‑return pathways for each engine vent, improving pressure relief efficiency. Heat‑shielded crankcase breather and oil return lines protect surrounding components from thermal stress. The coolant bleeder valve circulates engine coolant through the separator to maintain temperature parity and prevent moisture accumulation. Precise dimensions of 4 inches outer diameter and 5.75 inches height ensure compatibility with Subaru EJ series engines from 2002‑2008. The unit features a bespoke COBB color combination and laser‑etched logo for brand identification. Installation requires routing three dedicated inlet ports to the AOS and securing the unit with provided hardware. For optimal performance, pair the separator with a custom Migtuned etune specific to the vehicle year and model via https://www.migtuned.com/etune/subaru-wrx-2002-2007.

                  
                                          
                        
Holding Capacity
                        
1 Liter
                      
                                          
                        
Integrated ORB Ports
                        
Yes
                      
                                          
                        
Body Material
                        
Cast Aluminum
                      
                                          
                        
Finish
                        
Black Powdercoat
                      
                                          
                        
Heat Shielding
                        
Yes
                      
                                          
                        
Coolant Bleeder Valve
                        
Yes
                      
                                          
                        
Dimensions (OD)
                        
4 inches
                      
                                          
                        
Height
                        
5.75 inches