Radium V2 FPD-R Fuel Pulse Damper, 8AN ORBThe Radium Engineering 20 0776 V2 FPD R is a compact fuel pulse damper for high performance and boosted fuel systems. Designed to absorb oscillating pressure pulses created by fuel injector opening and closing, the FPD R stabilises fuel rail pressure across the entire RPM range correcting idle surge, erratic lean AFR spikes, and "stumbling" that are difficult to tune out, especially with high flow injectors. V2 Update: Even after tightening, the 8AN