Exhaust H Pipe vs. X Pipe: Difference?

Originally Posted by 1slow370

X and H pipes merge the exhaust streams differently so the sound is different between the two as well as the performance characteristics. an X pipe allows full stream crossover while the H pipe on allows pressure eualization to occur. Traditionally the x pipe has been shown to produce more power but all X pipes are not made the same the amount of overlap and the changing cross sectional area of the pipe as well as the smoothness of the transition all effect flow and scavanging. the less overlap you have the higher the cross sectional area but there is less crossover to help scavanging. they have to be designed carefully.