Applications: MkIII, MKIV ABA & AEG 2.0L. Direct fitment replacing inferior plastic factory rail. Larger passages ensure proper fuel flow for high-performance applications. Aluminum body keeps fuel cooler reducing detonation. Solid billet aluminum construction with O-ring port seals ensures leak free performance even under increased fuel pressure.(Factory plastic piece develops cracks over time due to heat, vibration, and stress.) CNC Machined in-house from 6061-T6 aluminum. Brackets are laser cut and brake formed from stainless steel for a perfect fit and lasting quality.