Home - Return to Previous Page
Click on image to zoom

Bosio DLC Race 520 (ULSD RATED) - Set of 4 Nozzles

Pricing: $399.00

Free Ground or Postal Service Shipping to the Continental U.S.



The New DLC Race 520 Stage 1 nozzle provides excellent fueling and atomization for extreme power (200hp+) TDIs; surpassed only by our Race 520 Stage 2.

Injector Calibration Service: We highly recommend our Injector Calibration Service. It is the only way to properly set up your new Genuine Bosio nozzles for ideal performance. Please CLICK HERE for more details.

These nozzles provided an additional 20 hp over the 0.260mm TDI-R nozzles in the VWRacingUK race car. 

They have supported over 230 hp with the right equipment configuration. Not recommended for daily driver low to moderate upgrade applications. This nozzle if more for higher horsepower Stage 4 and up level builds. 

All of our Bosio VE nozzles ship with new OEM sealing washers included.


Flow Data: +163% over Stock Flow (vs the 90hp Bosch DSLA 150P 706 nozzle)


Supports Power Outputs from: 140-230 hp (with supporting modifications)


Our new DLC line of nozzles come with a 5 year unlimited mileage warranty and will deliver fuel faster and with more stable flow control than the OEM type nozzles (with our calibration). The coatings eliminates the primary wear region of the nozzle and increases useful nozzle life by over 5 fold! 

The absolute best results will be obtained when used in conjunction with:

  • The Q Loader Flash Programmer and Kerma Tuning (see ECU Tuning)
  • A hybrid turbo (see our turbo upgrades)
  • An upgraded exhaust system, (please see our selection of downpipes and exhaust options)
  • Upgraded air charge cooling (see our front mount intercooler kits)
  • Water methanol, (see Snow Performance W/M)
  • Upgraded pre-turbo intake piping
  • Stronger lower end, (see H-beam connector rods)
  • ARP Head Stud Kits improved head sealing

A cam, cylinder head work, and drive train strengthening will also improve reliability and power. These injectors are for the BIG power TDI build. Such a set up will support 200+ whp. 

If you would like to buy a single nozzle CLICK HERE.


We have instructions for injector nozzle installation HERE.


Nozzles Explained on this Fact Sheet

Reviews / Q&A

Reviews and Q&A


  • R520
  • R520
  • Fratelli Bosio
  • Available
  • New


Shipping Information

  • Item Requires Shipping
  • 0.4 lbs.
  • W3.0000” x H1.0000” x L5.0000”
  • Free Ground or Postal Service Shipping to the Continental U.S.