â€™Master Plan

If you want the classic Flowmaster sound, S550 systems are now available

By Steve Turner
Photos courtesy of Flowmaster

There is no doubt the rumble of a Flowmaster exhaust is synonymous with the Mustang. Since Fox days, 5.0-liter engines and these signature chambered mufflers have created a unique tone that you can identify from a distance. Now you can add that sound to your new 5.0-liter Mustang, as Flowmasterâ€™s exhaust systems for 2015 Mustangs are ready to go.

Looking for a full cat-back system with a classic sound? Flowmaster has two new options to choose from, the traditional American Thunder system (pictured) and the more aggressive Outlaw system.

Both the companyâ€™s classic American Thunder and the rambunctious Outlaw systems are now available in either full cat-back systems or as axle-back systems. All configurations are built from 409S stainless steel and carry a limited lifetime warranty.

The cat-back systems are constructed from 3-inch-diameter, mandrel-bent tubing joined by the companyâ€™s Scavenger X-pipe crossover. The American Thunder system (PN 817730) is said to produce an aggressive sound inside and outside the car thanks to a pair of specially tuned Series 60 mufflers that exit through 4-inch tips.

If you want an even more aggressive tone, the system featuring the Outlaw mufflers (PN 817734) is said to be â€œnot for the faint of heart.â€

Listen to the system right here:

If you arenâ€™t looking for a complete exhaust makeover, you can get simple axle-back systems that replace the factory mufflers with either Series 60 (PN 817710) or Outlaw Series (PN 817731) mufflers. If you want something even tamer, there is also a Force II axle-back (PN 817681) that is said to deliver a moderate sound.

All the systems include detailed instructions and all the hardware needed to install them.