The APR Oil Catch Can System traps excessive crankcase oil vapors and gunk from entering the engine. The system eliminates a possible performance robbing boost leak, while reducing carbon buildup on intake valves, octane lowering oil vapors and oil pooling within the intake tract. It's a simple modification to install, drains in seconds with the flick of a knob, and is recommended at all stages of performance. Fits Volkswagen GTI 10-14​