As all RS500s started life as3dr cosworths, then they were mainly a kit of parts and an engine swap done by Tickford, so things like fuel lines are standard 3dr cosworth

Exhaust was standard 2wd with some restrictors welded into the ends of the two outlet pipes of the downpipe to control surge of the T4 in standard power output.

They ran a standard L1 weber ecu but it did have a different part number due to changes in the chip

The extra 4 injectors had a dummy loom which terminated at a blank socket located under the battery tray, they were just there for homologation purposes for racing.