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A glasspack is a type of muffler, and a Flowmaster(tm) is a brand of muffler; Flowmaster makes a single chamber muffler (glasspack).

A glasspack will add almost zero back-pressure to the motor (it is an open or single camber muffler), but they can damage newer motors and violate federal law (on newer cars) if not done right. Zero back-pressure will expedite valve and valve seat wear, and normally require higher pressure springs to ensure the valve works correctly.

Flowmaster mufflers, depending on which series you get, will not violate federal law on newer cars, and add some back-pressure to valves (and don't require valve train modifications (in some applications)).

Cost depends completely on what year of mustang, the motor, what type of muffler you get, what type of welds you specify (ZBP welds are more expensive), and any pipe modifications.

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Q: What has the best proformance adds more horse power a glass pack or a flowmaster and how much does it usually cost to dual a mustang?
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