SLP 99-04 GT/Mach 1 "Loud Mouth II" (modular) Exhaust System

SKU: SLP-M31007A

Manufacturer: SLP

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SLP 99-04 GT/Mach 1 "Loud Mouth II" (modular) Exhaust System

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SLP 99-04 GT/Mach 1 "Loud Mouth II" (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 race mufflers, the Loud Mouth II system is compatible with our original Loud Mouth resonators (#31062) and our all-new, straight-through-type Power-Flo traditional mufflers (#31065). Buy all three for complete control over your Mustangs sound and performance characteristics.

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


  • Includes Loud Mouth II bullet-type race mufflers for minimal restriction, reduced resonance, and an aggressive 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 304 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
  • Manufacturer SLP

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    • Mustang GT 1999,2000,2001,2002,2003,2004
    • Mach-1 2003,2004