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koen. macca, and most other teams evolve their cars and do not redesign every year. that is the reason for the stepped noses last year, and macca not having one. they were all using 2011 tubs.
a change in engine could mean the balance of the car being thrown out , neccessitating redesigned suspension points, new fuel cell etc etc.
not saying that IF macca changed supplier, then it would need a redesign, but the possibility is here.
remember brawn? when honda engine went, they wanted ferrari engine but it wouldnt fit, so they had to go for the shorter merc engine.