Vectra B - 3.8 BAR Fuel Pressure Regulator X25XE C25XE
The standard fuel regulator fitted to these engines runs at 3.0 bar. By fitting this 3.8 bar regulator, the fuel pressure in the rail will be increased, allowing quicker fuel delivery (without overfuelling the engine). This gives a sharper throttle response, and also helps the engine overcome the notorious flat spot.
This fuel pressure regulator fits the following:
Calibra (1989-1997); X25XE engines
Cavalier MK3 (1989-1995); C25XE & X25XE engines
Vectra B (1996-2002); X25XE engines