Owen Developments Vauxhall VXR Bolt-On K04 Upgrades (Mk. 5 Astra VXR/Zafira VXR, Z20 LEH)

Owen Developments offer three stages of turbo upgrade to Vauxhall 2.0L turbo engines as fitted to the Mk. 5 Astra VXR and Zafira VXR. These upgrades are based on genuine Borg Warner K04 turbos and the standard VXR exhaust manifolds making these turbos bolt-on units.

All power figures given are approximate and assuming there are no other upgrades on the engine.

Stage 1 <310bhp

  Owen Developments designed and manufactured 360° thrust bearing kit for increased reliability and allowing for increased boost levels

  Turbine and Compressor wheels balanced to a higher tolerance than standard

Stage 2 <310bhp

  Cut back turbine blades to improve exhaust gas flow at high engine load

  Owen Developments designed and manufactured 360° thrust bearing kit for increased reliability and allowing for increased boost levels

  Turbine and Compressor wheels balanced to a higher tolerance than standard

Stage 3 300-330bhp

The same specification as Stage 2, with the exception of;

  K06 Billet Compressor Wheel

  Re-profiled compressor cover to capitalize on the fitment of the K06 wheel

Stage 4 330-350bhp

The same specification as Stage 2, with the exception of;

  Lightweight HTA™ Billet Aluminium Compressor Wheel with an advanced aerodynamic profile for unrivalled transient response and efficiency, available in red, blue, gun metal and silver

  65mm Compressor Wheel Exducer

  Re-profiled compressor cover to capitalize on the fitment of the HTA™ wheel

  Forge Motorsport Actuator and Recirculation Valve