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SKU : SLP-M31004

SLP 99-04 GT/Mach-1 "PowerFlo" (modular) Exhaust System

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SLP 99-04 GT/Mach-1 "PowerFlo" (modular) Exhaust System

SLPs Mustang cat-backs have always been the best-performing exhaust systems in the business. Now theyre the most versatile, too! Using groundbreaking modular technology first seen on our Mustang X-pipes, weve developed a line of systems that can be quickly reconfigured to fit changing performance, noise-level, and sound-quality requirements. Simply loosen a few band clamps, swap muffler types, retighten, and youre done. No other exhaust offers this level of performance and adaptability!

Along with the included mufflers, the Mustang Power-Flo system is compatible with our original Loud Mouth resonators (#31062) and our all-new, bullet-type "Loud Mouth II" race mufflers (#31064). Buy all three for complete control over your Mustangs sound and performance characteristics.

NOTES: Includes Power-Flo mufflers. Loud Mouth resonators and Loud Mouth II race mufflers sold separately.


  • Includes straight-through-type Power-Flo mufflers for superior performance; minimal resonance; and a deep, rich tone
  • Employs SLPs exclusive modular technology, making it possible to switch between muffler and resonator types in a matter of minutes
  • Engineered and built to OEM standards to ensure proper fit
  • Constructed entirely from mandrel-bent stainless steel
  • Features show-quality polished mufflers and 3.5" double-wall tips with electromarked SLP logo
  • For 1999-2004 GT and Mach I models
  • Vehicle Application(s)

    This product fits the following models and years

    Mustang GT1999 2000 2001 2002 2003 2004
    Mach-12003 2004

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