Professional Type 2 dual-piston BLOW-OFF valve (loud, atmospheric) manufactured by PROPERFEKT, supplied with a complete installation kit for:

• Opel Astra GTC

• Engines: Z20LET, Z20LER

The kit includes all required mounting accessories and two springs with different stiffness levels for the blow-off valve.

Technical Specification

• Type 2 atmospheric blow-off valve

• Dual-piston design

• Two springs with different stiffness:

  • Soft spring installed by default

  • Hard spring for higher-than-stock boost pressure

Kit Includes

• Type 2 dual-piston blow-off valve

• Intake pipe without MAP sensor provision

• Silicone elbow

• DV blanking plug

• Vacuum hose

• Two springs (soft and hard)

Additional Information

• Maintenance-free operation up to 2.5 bar boost pressure

• No adjustment required

• Suitable for soft turbo setups and high boost applications

Installation Notice

• Installation by a specialized workshop is recommended

• Product dedicated to track and motorsport vehicles

• Blow-off valve replaces the factory DV valve

• May cause a check engine warning

• ECU remapping may be required to permanently disable related fault codes

Warranty and Production

• 100% Polish-made product

• 2-year manufacturer warranty

• Two free services within 36 months:

  • Piston cleaning

  • Lubrication

• Service parts available

• Valve regeneration possible

• Manufactured to individual order

• Lead time: 2–3 business days