how stuff works stuff work is a very informative site.
The exhuast entering the turbo rotates the turbine which is on the exhuast inlet side of the turbo.. the turbine is connect to the compressor, so when the turbine is spinning due to the exhuast gases the compressor wheel is also spinning at the same rpm. The compressor fins or blades are arrange in such a maner so that the it sucks air from the fresh air inlet and forces it through the outlet and into the IC. The exhuast gases entering into the turbo is then exhuast out the exhuast outlet..blah blah through the cat, piping and muffler. Cool air gets forced through the cooler and into the engine. BOV is installed into the inlet piping to the engine which releases the air when shifting gear or when the pressure inside the pipes is greater than the preset pressure of the BOV which is controlled by the spring instide the BOV.
If pressure inside pipe > pressure of the springs = release air into Atmosphere.
You can also get cars that have turbo charges as well as a Super charger.. very interesing setup. :)
