Manley Valve - Exhaust, Valve-P/F 1.600,+.100 firebird Viscosity Index 158

Viscosity Index 158

Reduce weight and improve performance in your 2015-2023 S550 Mustang with a Rear Bumper Support from BMR Suspension

This front sway bar is more rigid than the factory front sway bar and bolts directly in place with no modifications

25-inch DOM steel tubing

Upgrade to this double adjustable panhard bar for superior strength and rear end control

Manley Valve - Exhaust, Valve-P/F 1.600,+.100 firebird Viscosity Index 158Manley Severe Duty Valves deliver the ultimate in strength, reliability, and high performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH 428 for exhaust and NK 844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400F, Manley exhaust valves endured 100 million cycles, while competitors failed after just