yes i agree in principal,but the engine i have just got back is a great engine and good spec which i can just bolt straight in,which will be cheaper than modifying the rs500 engine to a similar spec.youre right though about it ending up looking like a 3 door with rs500 spoilers then----oh i dont know what to do.i was also contemplating using the wrc inlet manifold that was on the engine as ive got the ecu and everything to plug in and go,but again it makes it less of an rs500 even more......wish i had just a 3 door now!!!!!