Made by Maniflow, this premium performance LCB has an enlarged and reshaped middle pipe which creates a type of vortex, complementing the pulsing effect of the outside two pipes. This can produce improved BHP, torque and power curve in high some performance 1275s and street 1380s. Collector exit is 1.75" I.D. Ref: C-AEG376, LM004S11R, C-AEG365S2.