Dual Piston Blow off Valve BOV MK4 MKIV A4 S4 1.8T 2.7T

*** IMPORTANT NOTE: Order processing can take up to 1-2 business days. Shipping timeframes start after the order processing has been completed. ***

Designed for turbocharged vehicles equipped with a mass air flow (MAF) sensor, this Dual-Piston Atmospheric Blow-Off Valve V2 delivers fast response, reliable boost control, and the aggressive “whoosh” sound enthusiasts expect — without the drivability issues common with traditional single-piston or diaphragm-style valves.

Designed to work with factory charge pipes and most aftermarket setups using a standard blow-off valve flange or hose-style connection.

Constructed from high-quality billet aluminum, the updated V2 design features revised internals and a fully billet secondary piston for improved durability under high boost and heat conditions. The valve is fully serviceable with a twist-off top for quick maintenance and inspection.

The dual-piston, counter-balanced design helps prevent idle air leaks often found in single-piston valves, reducing the risk of rough idle, stalling, and inconsistent fueling on MAF-based vehicles.

Key Features

• Dual-piston, counter-balanced design
• Fully billet aluminum construction
• Revised V2 internal design for improved airflow
• Billet secondary piston (no Delrin)
• Fast boost response and improved boost retention
• Aggressive atmospheric discharge sound
• Fully serviceable design for easy maintenance

What’s Included

• 1x Dual-Piston Atmospheric Blow-Off Valve
• 1x Inlet Pipe Plug
• 2x Hose Clamps
• 1x Silicone Adapter