1) ZF, full name is Zahnradfabrik Passau GmbH. Gearbox manufacturer in Germany, and as Germanic said supplies gearboxes to a lot of european car companies.

2) Difference between wet and dry sump. Basically A wet sump engine has an oil pan at the bottom of the block to store the engine oil. A pump at the bottom of the pan will supply the oil to the rest of the engine. A dry sump engine has an oil storage tank outside the engine. A pump is required to supply the engine oil to the engine, and another pump is required to return the oil from the engine back to the tank.

The reason why most high performance engine uses dry sump lubrication is because the oil pan for the dry sump engine is very small, therefore the engine can be placed lower in the engine bay than before, this can lower the centre of gravity of the car.

3) incoming air flows through the airbox and then to the intake mainfolds. The airbox contains filter to clean the air going into your engine. Redesigning the airbox can increase engine performance or economey by increasing the mass flow rate through the airbox, and to the engine.

hope that helps, and hope what i said make sense