Okay, you’ve decided that your vehicle is not fast enough, and you need the kind of horsepower that only a supercharger can deliver. But now, you’re left with two critical decisions: What type of supercharger should you get? And, what brand should you get? Of course, these questions always lead into the gearhead rabbit hole, but let’s figure it out.

Types of Superchargers and Turbochargers
Centrifugal, Roots & Twin Screw Blowers
There are 3 main types of superchargers: centrifugal blowers, Roots blowers and twin-screw blowers. They each have their plusses and minuses, just like they each have their champions and decriers. Here’s a macro-level overview:

Centrifugal Blower
Mechanically driven off crankshaft Dynamic compression type Boost pressure increases with engine RPM Accelerates air and exchanges the velocity by diffusing the pressure Mid- to high-priced superchargers

Roots Blower Mechanically driven off crankshaft External compression type Boost pressure stays fixed at all RPM its the lowest priced brand of superchargers

Twin Screw Blower
Mechanically driven off crankshaft Internal compression type, Boost pressure increases with engine RPM. This is the most expensive of superchargers.

Source:http://www.autoanything.com/superchargers-turbochargers-intercoolers/10A54974.aspx

contributions are welcome...auhanson, lomomike, Eyop, autosbay...etal

http://mbworld.org/forums/e-class-w210/460440-e200-tuning.html
auhanson check this thread for costs



also:
http://mbworld.org/forums/e-class-w210/237951-start-my-turbocharged-e320-project.html

Just to buttress what you posted

Let's start with the similarities. Both turbochargers and superchargers are called forced induction systems. They compress the air flowing into the engine­ (see How Car Engines Work for a description of airflow in a normal engine). The advantage of compressing the air is that it lets the engine stuff more air into a cylinder. More air means that more fuel can be stuffed in, too, so you get more power from each explosion in each cylinder. A turbo/supercharged engine produces more power overall than the same engine without the charging.­
The typical boost provided by either a turbocharger or a supercharger is 6 to 8 pounds per square inch (psi). Since normal atmospheric pressure is 14.7 psi at sea level, you can see that you are getting about 50-percent more air into the engine. Therefore, you would expect to get 50-percent more power. It's not perfectly efficient, though, so you might get a 30-percent to 40-percent improvement instead. ­
The key difference between a turbocharger and a supercharger is its power supply. Something has to supply the power to run the air compressor. In a supercharger, there is a belt that connects directly to the engine. It gets its power the same way that the water pump or alternator does. A turbocharger, on the other hand, gets its power from the exhaust stream. The exhaust runs through a turbine, which in turn spins the compressor (see How Gas Turbine Engines Work for details).
There are tradeoffs in both systems. In theory, a turbocharger is more efficient because it is using the "wasted" energy in the exhaust stream for its power source. On the other hand, a turbocharger causes some amount of back pressure in the exhaust system and tends to provide less boost until the engine is running at higher RPMs. Superchargers are easier to install but tend to be more expensive.

Source: http://auto.howstuffworks.com/question122.htm