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Bosio Race 520s are among the heaviest fueling nozzles offered for Rotary Pump TDIs. They fuel substantially more than Power Plus 764s.

These nozzles are generally considered too big to use in an otherwise stock TDI: Upgraded turbo, breathing, intercooling, and, of course, tuning should be considered required to get the best results and manageable smoke levels with these nozzles. They may not be the best choice with our VNT 17/22: PP764s or PP502s may work better.

Includes injector seals.

  
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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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