Hypercoils 16" UHT Barrel 2-1/2" I.D. Coil-Over Spring - 138 lb. H76903FXL 5/16 in ID

5/16 in ID

1/2 in NPT Female to 10 AN Male

All Holley model 2010

This muffler is directional

and a billet fill cap

Hypercoils 16" UHT Barrel 2-1/2" I.D. Coil-Over Spring - 138 lb. H76903FXL 5/16 in IDOptimum Body Diameter (OBD) Hypercoils feature a unique design concept that adjusts the body diameter of the spring relative to the end coils. The OBD design enables Hyperco to take full advantage of its ultra high tensile material by optimizing the applied stress through adjusting the spring's body diameter. The results are in and they are simply incredible: More Deflection Less Weight Increased Rate Linearity More Resistance to Bowing Fits All