Scavenger Y Collector 2.5in/3in 1983-chevrolet-c20-esi5934304 A second pressure spring is

A second pressure spring is included allowing you to increase the fuel pressure range up to 65 psi for EFI systems

This HP EFI kit can control that too

Water Neck - 90 Degree - 1-3/4 in ID Hose - Swivel - O-Ring - Hardware Included - Aluminum - Black Anodized - Chevy V8 - Each

Holley's spacer goes between the damper and the damper bolt to fill that extra length

Breather - Slant-Edge - Push-In - Round - 1-1/4 in Hole - Recessed Ford Oval Logo - Aluminum - Chrome - Each

Scavenger Y Collector 2.5in/3in 1983-chevrolet-c20-esi5934304 A second pressure spring isFlowmaster's unique, patented Scavenger Series Y Collector is founded on the principle of Pulse Technology. The large D Shaped ports in the collectors create a large surface area to help pull the exhaust pulses from the opposing connected cylinders. This creates a cleaner burn for the incoming fuel and air resulting in an increased and broader torque curve, putting more power in the rpm range. Flowmaster's Three Year limited warranty protects the Y