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
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