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Originally Posted by JasonG
Diesels like it warm.
Mine loves the 195deg thermostat I put in it.
A warm air intake is good too, I've heard of people putting shrouds around the exhaust even.
Mine just pulls warm underhood air.
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Actually diesels like cold air better. It results in a cooler combustion which looses less heat to the cooling system and puts the energy saved into moving the piston. It also allows you to pack more air in the cylinder which further keeps the combustion cooler. More air also allows for a more complete combustion.
The only thing a warm air intake helps on a diesel is warm up time. Other than that it just makes more NOx and reduces power and fuel economy.
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Opening the exhaust is good if it doesn't lower your boost.
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Opening up the exhaust never hurts boost as it reduces back pressure allowing a bigger pressure drop across the turbine of the turbo. Of course on the newer TDIs the boost is limited by the computer, but this is still a win because the back pressure on the engine is less.
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Bigger injectors will give better FE. Tdiclub.com lists the combinations that will work for your model on their FAQ page.
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Bigger injectors usually give more fuel and more power not better economy.