Wunderkind
Chicane Challenger
It doesn't make sense that the SL53 has more power than the SL63. 654HP combined vs 612HP. This cant be correct, maybe it should be 450hp +20hp.
The SL53 makes a lot of sense for Europe and markets like China, Thailand, Singapore, and Malaysia where taxes are tied to engine size(displacement). The V8-equipped SL55 is most probably a US-only model at this stage. Also, I remember some AMG guy once remarked that the in-line 6 engine is not a "true" AMG engine.