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SKU : SLP-M31006

SLP 99-04 Cobra "Loud Mouth I" (modular) Exhaust System

Regular Price: $699.99

Special Price $629.99

Mustang performance parts, performance and tuning
Customer Reviews


SLP 99-04 Cobra "Loud Mouth I" (modular) Exhaust System

SLPs Cobra 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 Cobra Loud Mouth system is compatible with our all-new bullet-type Loud Mouth II race unit. Get both for complete control over your Cobras sound and performance characteristics.

NOTES: Includes Loud Mouth resonators. Loud Mouth II mufflers (P/N 31064) sold separately.


  • Added a consistent 25 rwhp on our stock ˜03 Cobra test car (modified vehicles will see considerably larger increases)
  • Employs SLPs exclusive modular technology, making it possible to switch between muffler and resonator types in a matter of minutes
  • Includes our infamous Loud Mouth resonators for minimal flow restriction and the meanest sound around
  • Dyno-proven to outperform competitive resonator-type exhausts
  • Engineered and built to OEM standards to ensure proper fit
  • Constructed entirely from mandrel-bent stainless steel
  • Features show-quality polished resonators and 3.5" double-wall tips
  • For 1999-2004 SVT Cobra models
Vehicle Application(s)

This product fits the following models and years

SVT Cobra1999 2000 2001 2003 2004

Customer Reviews 1 item(s)

Great exhaust. But not the right material
I opened the shipping box and could see the quality from the start. The piping was well bent and the exhaust tips look great! Delivery was fast and service was great. As usual from Lethal Performance. Review by Mike / (Posted on 2/17/2017)

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