SLP 4.6L LoudMouth Cat-Back Exhaust | Ford Mustang (99-04) (M31007)

The SLP LoudMouth Cat-Back Exhaust System is an aftermarket exhaust upgrade for the 1999–2004 Ford Mustang with a 4.6L engine. Designed to replace the exhaust components behind the catalytic converters, it provides an alternative to the factory cat-back system. The product title identifies the LoudMouth configuration and cat-back design, but no further specifications are provided for materials, pipe diameter, muffler construction, sound level, or performance gains. Buyers should consult the manufacturer’s detailed product information to confirm those characteristics before purchase. This system is intended for Mustang owners seeking an SLP-branded exhaust component for their vehicle, with fitment limited to the application stated in the product name.

Fitment is listed for 1999–2004 Ford Mustang models equipped with a 4.6L engine. The available product information does not specify body style, transmission, trim-level restrictions, chassis code, emissions certification, or compatibility with other modifications, so verify the exact vehicle configuration with SLP before ordering. This is a cat-back system, but the listing does not state whether installation is bolt-on, whether cutting or fabrication is required, or what hardware and exhaust components are included. No intended street or track use, installation instructions, or additional fitment notes are provided. Confirm the system’s contents and installation requirements for the specific Mustang before beginning installation.