Our merge collectors, with a secondary transition, offer optimalperformance by increasing exhaust velocity through the merge area and thentakes advantage of the exhaust charge expansion after the merge. This acts likea syphoning effect that greatly increases exhaust scavenging. Available in a variety of primaryinlet, merge and secondary sizes, these merge collectorsare handmade using American made bends.Engineered to obtain the high flow andvelocity only available in a true merge collectors, every unit is purge tigwelded and incorporates a transition spike that is internally blended. Thisinternal blending and spike design, makes the transition from the primary tubeto the collector, as smooth as possible. This smooth transition maintainsexhaust velocity, improving volumetric efficiency.