Inlet
Cams
Throttle body
MAF Sensor
ECU
Inlet manifold is bigger on an RS1800, they have HO stamped underneath too so you can tell its an RS1800 one. I would assume the inlet ports are bigger too.
They also have oil jets in the bottom end.
The early ones also have a different downpipe.
Last edited by fiend; Apr 12, 2009 at 12:31 PM.