Provides a fast response rate, for stable fuel delivery, for the most demanding requirements. These regulators maintain steady fuel delivery duringdramatic changes in fuel demand, such as WOT conditions, boostapplication and gear changes. Hardened steel ball, replaceable steel seat, and Fluorosilicone diaphragm. Compatible with most racing fuels including ethanol and methanol. Fuel pressure increases on a 1:1 ratio with boost. User serviceable, replaceable, and interchangeable internal components.