Hypercoils Pigtail Rear Coil Spring - 12" Tall x 5-1/2" O.D. - 175 lb. - Stock Appearing Inverted Flare to Hose Barb Fittings The pressure on the head

The pressure on the head from the earmuffs can be adjusted by changing the special foam rubber pads (supplied) positioned between the earmuff and the helmet

In the racing world

pre-1968 domestic vehicles certified to federal standards and all pre-1968 foreign vehicles)

allowing an easy installation into the nitrous system

Hypercoils Pigtail Rear Coil Spring - 12" Tall x 5-1/2" O.D. - 175 lb. - Stock Appearing Inverted Flare to Hose Barb Fittings The pressure on the headRear coil springs have a pigtail on one end and a flat on the opposite end and are offered in two different versions. "S" series springs are 12" tall x 5 1 2" O. D. whilde the "R" series springs are 11" tall x 5 1 2" O. D. All springs are painted black for "stock" appearance. Hypercoils are manufactured from the highest quality chrome silicone steel and high tensile chrome silicone steel available in the world. The material used in producing