Cup power

V6 airbox, different inlet/plenum, larger cable throttle body, different ecu maybe sumar i missed
 
it doesnt have to meet euro5 emission regs so runs a more open ecu with regards to fuelling and timing etc

iirc the ignition sytem is also different

plus it has the airbox and cable throttle body system

and arp rod bolts :bat:
 
http://auto-media.info/2011/10/01/renault-clio-r-s-%E2%80%9Cange-demon%E2%80%9D-a-devilish-clio-with-the-face-of-an-angel/

Jean-Maxime Boulanger, Product Manager for Clio Renault Sport, confesses: “The Clio R.S. “Ange & Demon” is a version of Renault Clio R.S. that exercises an instant attraction.
It has a contradictory personality, with its ‘bad boy’ looks, Cup chassis, 203 hp of performance, but with an array of carefully selected equipment. Clio R.S. “Ange & Demon” will give wings to our purist customers who will be bewitched by its tempting looks but reassured by its good manners and day-to-day competence.”