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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.
Opening the exhaust is good if it doesn't lower your boost.
Bigger injectors will give better FE. Tdiclub.com lists the combinations that will work for your model on their FAQ page.
All that aside, as UFO said, the VW TDI is hard to improve upon.
The cars aerodynamics however are like a brick.
Anything is better than factory, airdam, grillblock (upper not lower), skirts and a kamm or boat tail.
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