Mid America Motorworks now offers a 1 5/8" Merged Competition Header System for use with special 1 1/2" flanged racing heater boxes. This enables you to have a defroster/heater system and still have a hi-performance merged exhaust system. Header features thick H.D. Flanges with smooth gasket surfaces. All internal welds are ground down for true high flow performance. Headers are supplied with a swivel flange racing stinger.