Some Opel Engines come with something called TwinPort Technology. I guess that this increases power, as the original Z12XE (1.2) engine has 55kW, and the TwinPort (Z12XEP) version engine has 59kW of horsepower.
How does it work?
Why does it work?
Is this computer controlled?
What are the differences between the standard and Twinport engines?
Are there any disadvantages or other benefits of this system?