Twin Valve Kit with Adjustable Venting Bias Control

The GFB T9013 kit combines two proven valve designs in one package: one Respons TMS and one Mach 2. Both valves are built around GFB’s adjustable venting bias concept, allowing you to tune how boost pressure is released when you lift off the throttle.

Includes One Respons TMS + One Mach 2

This kit gives you a matched pair of valves for the twin-valve layout used on the listed Kia/Genesis applications. It’s a practical way to gain venting adjustability and stronger valve control compared with factory setups.

Adjust the Sound and Venting Behaviour

The adjustable venting bias system lets you control the split between recirculating air back into the intake and venting to atmosphere. Run it quieter for subtle operation, open it up for more pronounced blow-off sound, or set a balanced middle ground.

Sharper Response Between Gear Changes

By controlling boost release efficiently, the valves support fast boost recovery and responsive throttle feel after shifts — ideal for daily driving and spirited use alike.

Built for Demanding Turbo Use

Both valves are engineered for repeated heat cycles and boost events, offering a durable solution for performance-focused turbo platforms.