A Mercedes E320 will never be a muscle car. There are no ways to make it faster that don't cost a lot of money. The easiest way to have a faster E-Class is to buy one with a V8 under the hood. Both the E320 and the E420 (or E430) use premium fuel but the V8 will use more. The trade off is greater torque, a smoother acceleration curve, and greater speed. The suspension upgrade comes with the more powerful engine. There ARE ways to make your E320 handle much better. Replacing the front and rear sway bars with the ones from the Sport package makes a big difference, and replacing the rubber brake lines with braided stainless over teflon ones changes the sponge-like feeling felt when the rubber expands during braking. The pedal feel is much improved. Mercedes engineers have gone to great lengths to make a very reliable, long-lived engine for the E320. Trying to change things would not be a good idea. P.