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Mustang PartsMustang Exhaust99-04 Mustang ExhaustMustang SLP Loudmouth Catback (99-04 GT / Mach 1 / Bullitt)

Mustang SLP Loudmouth Catback (99-04 GT / Mach 1 / Bullitt)

Item #:23001
Manufacturer Info:SLP M31007
Market Price:$524.99 - You Save 9% ($45.00)
Our price:$479.99
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Mustang SLP Loudmouth Catback (99-04 GT / Mach 1 / Bullitt) - SLP M31007
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Product Features
Quick Facts
  • Rich, throaty exhaust tone
  • Loudmouth "shotgun" race resonators included
  • Versatile modular design
  • 2.5" 304 stainless steel tubing
  • 3.5" polished 304 stainless steel tips
  • Fits 1999-2004 GT, Bullitt, & Mach 1 Mustangs

What's in the box?

With an SLP Loudmouth cat-back exhaust system, you'll gain a loud aggressive sound and reclaim lost horsepower, all while sporting 3.5" polished stainless tips.

More Power and Sound.   This SLP system includes SLP's infamous Loudmouth "shotgun" race resonators that offer virtually zero flow restriction to free up more power and to produce the most aggressive sound possible.

Modular Design.   SLP's unique modular design allows you to quickly and easily switch out the mufflers or resonators to suit your driving needs. Along with the included resonators, the Loud Mouth system is compatible with all SLP mufflers and resonators including the bullet-type Loud Mouth II and the traditional-style PowerFlo Muffler.

Superior SLP Construction.   This SLP Catback system is made from mandrel bent 2.5" 304 stainless steel tubing for for its excellent non-restrictive flow characteristics and long life. The system ends with a brightly polished 304 stainless steel 3.5" tips, that are electro-marked with the distinctive SLP logo, giving a great finishing touch and a show quality look.

Application.   Designed to be a direct bolt on, this SLP Loudmouth catback will bolt straight up to the factory Mid-Pipe without any extra modifications required on the 1999-2004 GT, 2001 Bullitt, or 2003-2004 Mach 1 Mustang to give it a rich, throaty sound.

Hardware Included

  • (8) 2.5" exhaust clamps

Stock Exhaust
Aftermarket Exhaust


Catback Exhaust Specifications

Piping Material: 304 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 2.5"Tip Size: 3.5"
Muffler Type: Straight-through Fitment: 1999-2004 GT / Mach 1 / Bullitt Mustangs


Installation Instructions
Mustang SLP Loudmouth Catback (99-04 GT/Mach 1) - Installation Instructions! Mustang SLP Loudmouth Catback (99-04 GT/Mach 1) - Installation Instructions!
Mustang Rear Gears - Tech Article Buyers Guide to Mustang Exhaust - Tech Article Mustang Rear Gears - Tech Article Understanding Mustang Exhaust - Tech Article

Mustang Fitment: 1999, 2000, 2001, 2002, 2003, 2004

Installation Time:

(approx) 2 Hours

Difficulty Level:

Advanced mechanical skills required.

What's in the box?

Hardware Included:
  • (10) Ten Clamps

Installation Guides:

>> SLP Loudmouth Catback Installation Guide (99-04 GT/Mach 1)
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