H Series Drag Series Race Header Tri-Y 6 Step True Big Tube 3" Collector H22 SMSP H22A4 H22A F20BH Series Drag Series Race Header Tri Y 6 Step True Big Tube 3" Collector SMSP Our Drag Race Series header features a true 6 step collector header design 3 inch V band collector with turn down included to eliminate the exhaust system and reduce weight. This header is not designed for stock engines. This is a race series header it should only be used with high compression H series engine builds or engines running 100+ shot of nitrous or superchargers.