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Term	Definition
ECU (Electronic Control Unit)	The ECU is a computer which controls most of the cars electrical system, ie ignition, fuel, anti-lock brakes. When people talk about "chipping" there car, they change one of the IC's (Integrated Circuits). Changing the IC or chip will change the car's characteristics, you might get better performance but fuel economy will be affected.
EFI (Electronic Fuel Injection)	A computer controls fuel fuel system.
Exhaust manifold	A part which connects the engine block to the exhaust.
EDIS	Electronic Distributor Ignition System.