Quick view Helical Technology Helical Technology High Performance Exhaust Valves for Custom Applications ★★★★★ (0) MSRP: $495.95 - $546.95 Helical Technology is the UK's foremost producer of high specification engine control systems supplied to many of the world's leading vehicle makers, manufacturing valves of the highest quality for... Choose Options Choose Options Add to Wish List Add to My Wish List Create New Wish List