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

SKU: SLP-M31007

Manufacturer: SLP

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

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SLP 99-04 GT/Mach 1 "Loud Mouth" (modular) Exhaust System SLPs Mustang Loud Mouth has always been the best-performing cat-back exhaust in the business. Now its the most versatile, too! Using groundbreaking modular technology first seen on our Mustang X-pipes, weve developed a system 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 system offers this level of performance and adaptability!

Along with the included resonators, the Mustang Loud Mouth system is compatible with two all-new SLP mufflers”the bullet-type Loud Mouth II race unit (#31064) and the traditional-style Power-Flo (#31065). Buy all three for complete control over your Mustangs sound and performance characteristics.

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


  • Includes our infamous Loud Mouth resonators for virtually zero flow restriction and the meanest sound around
  • Employs SLPs exclusive modular technology, making it possible to switch between muffler and resonator types in a matter of minutes
  • Dyno-proven to outperform competitive resonator-type exhausts
  • Engineered and built to OEM standards to ensure proper fit
  • Constructed entirely from mandrel-bent 304 stainless steel
  • Features show-quality polished resonators 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