Unlike anything else on the market these fuel rails are proper ""machined from the solid"" billet rails, not some cheap machined extrusion pretending to be billet. With accommodation for massive ""-8"" fittings, these fuel rails will easily cope with large capacity fuel systems using new generation large capacity fuel injectors. The twin top and single end entry/exits are designed to be configured as required. They are available to suit 11mm or 13mm diameter injectors, come supplied with two -8 plugs and mounting hardware to bolt up to either stock, or Process West Billet TGV's.