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    Back pressure robs your car of power and economy. Reduced back pressure will cause immediate gains in both power and economy. If you modify your engine, for every 8-10% in power increase you will gain 30% more back pressure which virtually chokes the motor. So any modification at the engine makes a free flowing exhaust and muffler system mandatory. 

    There are three basic factors in noise control: Restriction, Absorption, and Reflection.  Restriction is best for reduction of noise, but worst for power and economy (as high as 16lbs of back pressure).  Absorption is effective when you pack materials such as fiberglass inside casing, but this is usually quite loud,  especially when the packing burns out. Absorption doesn't control reversion. Reflection which is the most effective for power increase is done with baffles and reflector plates with nothing to burn out. 

    MAC Flow Path mufflers use reflection for maximum flow while still maintaining noise control. Instead of a single flow path, MAC Flow Path mufflers use two flow paths for twice the flow and reflection area, while remaining a true anti-reversion muffler. This is what makes Flow Path mufflers the Best Choice!  MAC Flow Path mufflers.

MAC guarantees more flow, less reversion and smaller physical size than FlowMaster #42543 or DynoMax #17734

Flow Path™ Muffler Configurations

CENTER IN/OFFSET OUT     OFFSET IN/OFFSET OUT     CENTER IN/CENTER OUT