FAPO LS Swap Headers Cast Manifolds for C10 C1500 Silverado Sierra Yukon TahoeApplication: For LS motor swap on older Chevy, GM, Pontiac, Olds, Buick models Fits LS based engines (LS1, LS2, LS3, LS6, LS7, etc.) Note: NOT fit LS4 engines NOT work on standard SBC or BBC engines For LS series engine swaps only. NOT direct fit Features: 2 Bolts Collector Construction, collector Merge Spikes, gains over 20+ hp Excellent quality and durability to improve vehicle performance Shorty design for power gain from idle to mid range RPM