Well as a few of you know already I am looking to design some affrodable fuel rails for our FC's to include using AN fittings or Stock style nipple fittings. So I dug out the calipers today and I did some measuring.



Stock S5 rail has a inlet opening of 6.00 mm



The -6 AN fitting has a inlet of 7.0-7.05 depending on manufactuer



although a mm does not sound like a lot of difference, each little bit helps.



I should have some prototype photos next weekend.



I am looking to sell the kit for use with -6 AN or nipple fittings and stock or 1600cc injectors that will not require modifications.



Stay tuned.