ALL Campro engines are equipped with a plactic composit fuel rail, while most other engines have aluminum rail. Although composit fuel rail is better in terms of lighter weight, easier to produce and less heat conductive, it's prone to failure such as fracture, breakage and leakage, over time, under stress. When it comes to higher pressure (in most of the A-FPR applications), it's a better idea, if financially capable, to use an aluminum fuel rail.