What is a JBA Firecone?

Abrupt changes in manifold volume, like the transition from primary tube to collector, cause turbulence and reduce exhaust gas velocity. This turbulence restricts flow, which lowers performance. The JBA Firecone merge collector smooths the transition, maintaining exhaust flow speed and direction. This improves scavenging, where exhaust pulses help remove spent gases and draw in fresh air during valve overlap, increasing power and efficiency by boosting volumetric efficiency and reducing contamination.