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!