This new design mounts the injectors above and inside the curve of the intake runners to make room. This results in a much more compact design. I made this one out of stainless steel; oh what a bitch! It cuts O.K. and welds very nice but it's so very hard to grind and polish. If I ever do another, I will avoid stainless. I made the fuel rail out of brass and it is a pleasure to machine and can be silver soldered quite easily.