Малко само да се поправя :) twinport

"Twinport" controls the supply of the fuel-air mixture to the cylinders according to the engine's actual needs. At part load, one of the two intake ports leading into the cylinder is throttled. This causes an intensive swirl effect to develop as the mixture enters the cylinder, which in turn makes the engine more economical when operating with a high proportion of recirculated exhaust gas. At full load, on the other hand, the throttling device is opened, the cylinder receives a greater charge of mixture and full power is developed. By adapting the swirl movement of the incoming charge to suit engine operating conditions, maximum fuel economy is always achieved.