High revving engines need the extra protection of dual valve springs. Most high performance single valve springs will prevent valve float below 6500 RPM. Engines that are designed to exceed 6500 RPM should be equipped with dual valve springs.
2.5'' Double Electric Exhaust Valve Dual-Valve Dual-flap Y Pipe W/ Remote Switch
2" Electric Exhaust Valve Kit Y Pipe Control Dual Valve with Remote Switch 2inch
76mm 3" Exhaust Control Pipe Dual Valve Electric Y Pipe with Remote Kit UK
3 inch 76mm Exhaust Control Pipe Dual Valve Electric Y Pipe with Remote Kit
Wireless Remote Fit for Electric Exhaust Single/Dual Valve Downpipe I/Y Pipe
Dual Valve Spring Kit Steel Retainers For LS .660" 4.8 5.3 6.0 LS1 LS2 LS3 SK001
