We are talking about "KE " Bosch injection as standard on RS Turbo cars, " yes !!" bit confused at what you write at the manifold end, as each Fuel pipe goes to each Injector there !!.......if your concerned re - getting the pipes on the right injector...ie..thinking firing order ...it makes no difference as to what pipe from the 4 outlets on top of metering unit goes to injector..there is no firing order like ignition...the injectors them selves know when a Piston is at "compression" or "induction", hope of help hear. Peter [ just a bit confused at "manifold" end you write.