Manley Valve Spring, SPRING-1.580 DOUBLE 2007 Ford Mustang Navigator 6R80)

Navigator 6R80)

Combine this with eccentric adjustment bolts that can't handle hard launch with sticky tires

while isolating much of the engine vibration from the vehicles occupants

UMI’s 6565 F-150 lowered upper A-arm kit fits all 2015–2025 Ford F-150 models

keeping the tire predictable during long slides while remaining composed under track-day cornering loads

Manley Valve Spring, SPRING-1.580 DOUBLE 2007 Ford Mustang Navigator 6R80)From drag strips to short track and endurance circuits, the Manley NexTek series is engineered for serious racers. NexTek springs resist pressure loss and valve train degradation even in the most demanding race conditions. That means more consistent spring force deep into a run, reduced valve bounce, and improved overall stability for high RPM performance. Built to outperform and outlast in real world competition.