2004-2006 GTO Parts & Accessories - Exhaust & Headers

SLP Loudmouth II Exhaust System - 2004 Pontiac GTO


SLP's new GTO Loudmouth II exhaust system employs an integral X-pipe crossover and dual low-restriction mufflers to provide superior flow and performance, while minimizing interior resonance. Expect a smoother, mellower tone than that of our Loud Mouth system, along with a subtly aggressive edge under hard acceleration. Like all SLP exhaust systems, the GTO Loudmouth II is hand-built from 100 percent stainless steel and carries a limited lifetime warranty.

NOTE: Contents may vary slightly from photo.


  • Constructed entirely from mandrel-bent 304 stainless steel (2.5" OD)
  • Equipped with an integral X-pipe crossover for optimum performance and sound quality
  • High-luster PowerFlo mufflers combine great looks; superior flow; and a deep, muscular tone
  • Exclusive modular design allows easy interchangeability between mufflers and SLP race resonators
  • Features two hand-polished, double-wall tips
  • Designed to OEM standards of fit and durability
  • Covered by our limited lifetime warranty