TiAL 003974 MV-S 38mm External Wastegate with V-Band Flanges

The TiAL MV-S 38mm External Wastegate is an ultra-compact, high-performance boost control solution built for turbocharged applications. Engineered as an evolution of the F38 platform, the MV-S stands just 3.7" tall, making it one of the most space-efficient external wastegates available — ideal for tight engine bays and twin-scroll dual-wastegate setups.

V-Band inlet and outlet connections simplify installation, and the included mating flanges and clamps mean everything needed for mounting is in the box. With three lower air ports and two upper air ports, connecting pressure sources and boost controllers is straightforward without needing to rotate the actuator top. Plugs are included for all unused ports.

The MV-S is constructed from premium materials throughout for durability in extreme conditions. The valve is made from a high-temperature NiCrFe-based alloy, paired with a 347 stainless steel valve housing for superior corrosion and wear resistance. The valve seat and bushing use Nitronic 60 stainless steel, and all hardware is stainless steel. The actuator spring is formed from 17-7 PH stainless steel, maintaining consistent pressure resistance up to 900°F (483°C) without relaxing under heat. The actuator diaphragm is a high-temperature silicone Nomex reinforced design.

Integrated -4AN water cooling ports cycle a small amount of coolant through the actuator top to manage heat in demanding applications such as road racing, low-airflow engine bays, or rotary builds. This feature is not required for typical street use and has virtually no impact on the overall cooling system. The actuator top is available in color-anodized billet aluminum in Silver, Red, Blue, Purple, or Black.

Key Features:

• Ultra-compact 38mm external wastegate — only 3.7" tall
• V-Band inlet and outlet with included mating flanges and CNC machined stainless steel clamps
• Three lower and two upper air ports for flexible boost controller routing
• High-temp NiCrFe alloy valve with 347SS valve housing
• Nitronic 60 stainless steel valve seat and bushing
• 17-7 PH stainless steel actuator spring rated to 900°F (483°C)
• High-temperature silicone Nomex reinforced actuator diaphragm
• Integrated -4AN water cooling ports (optional use)
• Color-anodized billet aluminum actuator top (Silver, Red, Blue, Purple, Black)
• Supports boost pressures from 4.35 psi (0.3 bar) up to 24.66 psi (1.7 bar)
• All actuator springs included
• 304L stainless steel mating weld flanges with chamfered, counterbored edges for easier welding

Includes:

• (1) MV-S Wastegate Assembly
• (1) MV-S Valve Seat
• (1) Inlet Flange and Clamp
• (1) Outlet Flange and Clamp
• (2) TiAL Air Fittings
• (2) TiAL -4AN Removable Water Fittings
• (3) Plugs for Unused Air Ports
• (6) Actuator Springs (full spring set)