The JHM High Pressure Fuel Pump (HPFP) Upgrade will help you get the most out of the direct injection fueling system on your 4.2L FSI. Not only does the upgrade increase the amount of fuel your high pressure fuel pump can deliver but it will also decrease the duty cycle of the N276 solenoid on your pump. Lowering the duty cycle of the N276 will extend the life of this solenoid - an item that commonly fails on these pumps but isn't available separately. This upgrade kit is recommended for our JHM Stage 1 Supercharger Kits on the B7-RS4 and B8-S5 with the 4.2L FSI V8s.

The JHM HPFP Upgrade will fit all all Audis and Volkswagens with Hitachi High Pressure Fuel Pumps. This upgrade does not fit newer TSI motors with Bosch pumps.

NOTE: This is the JHM HPFP Upgrade for the 4.2L FSI V8 motor and includes the parts needed to upgrade 2x Hitachi HPFPs

FEATURES
- Piston has 50% more area than OEM (OEM Piston Size: 8.0mm versus JHM Piston Size: 9.8mm)
- Piston head optimized for ideal fuel flow direction
- Piston surface hardened before coating
- Piston machined after coating
- Upgraded spring, slightly stiffer than OEM for improved high RPM piston stability
- Uses OEM-style spring keeper

PARTS INCLUDED
- 2x Upgraded Piston w/ Directional Flow Head
- 2x Upgraded Spring
- 2x Spring Keeper and Tappet Assembly
- 2x Piston Cylinder or Sleeve
- 1x Installation tool

For install video please visit https://www.youtube.com/watch?v=DZPpQvJo4iU

Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.