The Dual Port is a 50-50 recirculation/vent-to-atmosphere valve for that classic vent-to-atmosphere sound at high boost

FPR12 Pro M 5 Port Mechanical Pump Suit -12AN (Black) TS-0404-1352

VAG V2 Dual Port kit:

StraightGate50 eWG – TS-0565-1002

the Bubba Sonic is a large and scary full time vent to atmosphere Blow-Off Valve

Clutch Kit - Xtreme Performance Heavy Duty Organic 610Nm 1300kg (30% inc.) KTY25002-1A Xtremeclutch The Dual Port is aXtreme Performance sprung organic kit 1A Recommended for: Street use in vehicles with minor engine modifications. Sprung organic clutch kits offer exceptional driveability for vehicles used daily but also have performance modifications. The sprung organic disc offers improved dampening which reduces the shock loading on the transmission. Specifications: Torque capacity 610Nm Clamp load 1300kg 30% Increased over standard Organic Friction Discs Heavy