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DLC 520 nozzles are a significant upgrade in fueling for ALH, AHU and 1Z TDIs. They are nominally the same size as .205s, but the DLC coating dramatically lowers internal friction - allowing the fuel injector to open and close much faster.  This ensures optimum injection timing and fuel flow, and the increased durability means a longer service life when used with ultra low sulphur diesel fuel.

This set of 4 nozzles will work well in a stock TDI, providing about a 15 HP and 25 ft./lb. power increase. They are also a good upgrade for chip tuned cars. These fit non-PD engined TDIs. Includes 4 injector seals.

 

Genuine, direct from Bosio.

Want these professionally installed on your injectors?  Check out our Complete Injectors with DLC 520 Nozzles already professionally installed!

  
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Volkswagen
  • Golf TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
  • Jetta TDI MkIII (A3 chassis) w/ AHU Engine (1997-1999)
  • Jetta TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
  • Jetta Wagon TDI (A4 chassis) w/ ALH Engine (2002-2003)
  • New Beetle TDI (A4 chassis) w/ ALH Engine (1998-2003)
  • Passat TDI (B4 chassis) w/ AHU/1Z Engine (1996-1997)
Established in Turin Italy in 1929, Fratelli Bosio has become a world-leader in nozzles for diesel engines. All Fratelli Bosio nozzles are made in their own factory in Italy to this day. The Sprint and PowerPlus line are popular upgrades for VE pump Volkswagen TDIs, while the SD line are the enthusiast-choice for replacement nozzles on the older Mercedes Diesels.

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