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They are the Sight Glass Manufacturers to go when looking to save money on fuel. Upgraded injectors or injector nozzles and an improved spray pattern than the stock injectors and when required are able to flow more fuel.

There are several upgrades that can be made to the TDi's to improve power, and to actually improve fuel economy even more. Another common upgrade for the VW TDi is upgraded injector nozzles.

Also the tuning boxes are well liked because they can be removed and have no trace of ever being there so that warranty work can be done.

They are also an inexpensive upgrade, and high on the bang for your buck scale. Both of these items, the VW performance chip and the VW tuning box change how the fuel is delivered to the engine. Cold air takes up less space, so in turn more air is able to occupy the same area because it is cold and not hot.