Date registered: Jan 2005
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1) they certainly do mate.
2) they're all the same, just a resistor or in the case of the better ones a variable resistor that tricks the ECM into thinking the rail presure is lower than it is.
3) In theory no parts should fail because the pump can only achieve so much rail pressure, but if your engine is high mileage or tired, you will have to expect possible failures of the injectors having high leak off which will result in hard starting or even the high pressure pump failing due to the higher demands on it.
Throw in higher cylinder temps & higher coolant demands, the head gasket could fail on higher mileage engines too.
All said & done all you're doing is putting a 108CDi to the 110 performance levels & if you've got a 110 taking it to the 112CDi levels.
I've got one on my 110, big increase in torque, don't really need 1st gear unless the van is loaded, better fuel consumption too!