This IE Aluminum Fuel Rail Set For Audi S4 2.7T engines have been machined in-house from 6061 aircraft aluminum, to provide a perfect fit and attractive one-piece design. The mounting posts have been machined into the rail for exact placement and a simple install. The inlet and outlet ports feature -8an o ring boss threads providing leak-free fuel flow for even the wildest setups. Factory injector clips have been retained for added safety and no worries of injector o ring leaks. Includes installation hardware for standard 2.7T manifolds. The fuel rail set is finished with a beautiful black anodize coating for erosion resistance against ethanol and race fuels.