1999-04 Ford Mustang 4.6 SLP Loudmouth Cat Back Exhaust System Stainless Steel GT - New Edge by SLP

Mustang SLP Loudmouth Cat Back Exhaust System Stainless Steel (99-04) 4.6

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Mustang SLP Loudmouth Cat Back Exhaust System Stainless Steel (99-04) 4.6

SLP’s Mustang Loud Mouth cat back exhaust system has always been the best performing cat-back exhaust in the business. Now it’s the most versatile, too!

Item #SLP-M31007

Everyday Low Price: $499.99

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  • Increased Horsepower
  • Virtually Zero Flow Restriction
  • Meanest Sound Around


  • Modular Design For Easy Muffler Swaps
  • Built to OEM Standards
  • Great Fit
  • Mandrel Bent 304 Stainless Steel

What's in the Box

  • (2) SLP Loudmouth Resonators With Starter Tubes
  • (2) Tail Pipes
  • (2) 3.5" Polished Stainless Tips
  • All Needed Hardware & Clamps

Made in the USA

Product Description

SLP's Mustang Loud Mouth™ cat back exhaust system has always been the best-performing cat-back exhaust in the business. Using groundbreaking modular technology, SLP has 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 you're done. No other system offers this level of performance and adaptability!

Along with the included resonators, the Mustang SLP Loud Mouth™ cat back exhaust system is compatible with SLP's bullet-type Loud Mouth II™ Mufflers (SLP-31064) and their traditional style PowerFlo™ Mufflers (SLP-31065). They both offer flow and performance similar to SLP's resonators but feature a ceramic-wrapped, perforated core that reduces high-frequency noise and in-car resonance for complete control over your Mustang's sound and performance characteristics.

SLP Loud Mouth Resonators
SLP's Loud Mouth™ "Shotgun" resonators offer wide open exhaust flow and race-ready performance with an ultra aggressive sound too match. Standard equipment on SLP Loud Mouth™ exhaust systems, each resonator boasts its own unique tone and flow characteristics. They are constructed from hand-polished stainless steel and embossed with the classic SLP logo.

NOTES: Includes Loud Mouth™ resonators. Loud Mouth II™ and PowerFlo™ mufflers sold separately.

- Includes SLP's infamous Loud Mouth™ resonators for virtually zero flow restriction and the meanest sound around
- Employs SLP's exclusive modular technology, making it possible to switch between resonator and muffler 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 electro marked SLP logo

-Fits 1999, 2000, 2001, 2002, 2003, 2004 Ford Mustang 4.6L GT, Bullitt and Mach1

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Customer Reviews

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2 of 2 REVIEWS
2 of 2 REVIEWS

  i love it car sounds amazing
By on 2/24/2014
I waited to buy this exhaust for over a year it was well worth the wait and I bought wheel and tire package I'm staying with latemodelresto

Yes, I would recommend this item to a friend!

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  Perfect upgrade
By on 7/1/2014
This is a very good exhaust a must hv mod easy install & good performance gains ??

Yes, I would recommend this item to a friend!

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Vehicle Applications

Ford Mustang - 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04)

About This Brand

SLP - Packaged Performance, Guaranteed Horsepower
SLP's Loudmouth exhaust is one of the most recognized systems on the market! They strive to offer the highest quality aftermarket components for Latemodel Mustangs! Their high quality exhaust components increase power, performance, and give your Mustang a louder exhaust tone for that true American muscle car sound. Choose from a variety of cat back, axle back, and resonator kits for your Mustang at LatemodelRestoration.com.

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