I know that the available engines for the US are the 3.2 V6, 5.0 V8, and 5.4 V8.<br> <br> However, why didn't Mercede-Benz supercharge the CLK55 AMG's 5.4 V8 just like the SL55 AMG.<br> <br> I thought all the 5.4 V8 AMG engines are supercharged versus naturally aspirated for future models.<br> <br> BTW, why hasn't Mercedes-Benz switch the automatic transmission into an infinite gear ratio system like a continuous variable transmission (CVT). It suits Mercedes-Benz's move to maintain the luxury of automatics while being sporty! It also feels like a manual... far better than Audi/VW/Porsche Tiptronic, BMW SMG II, or Ferrari F1. CVT is the future of transmission technology why hasn't Mercedes-Benz taken advantage of it? Especially, when the newer engines have outputs of over 350 hp. CVT has less drivetrain power loss and allows more power/torque to transfer to the pavement.