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SLP Loudmouth II Cat-Back Exhaust - Dual Side Exit (04-08 5.4L)

Market Price $434.99 You Save 12% ($51.04)
Starting At

$383.95 (each)

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  • Item T81000B
  • MPN# F31070

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Features & Details

  • Dual Side Exit Bolt-On Cat-Back Exhaust
  • T304 Stainless Steel Construction
  • 2.5" Mandrel-Bent Tubing
  • 3.5" Polished Slash Cut Tips
  • Dual Side Exit Design
  • Deep Exhaust Sound
  • Bullet Mufflers
  • Bolt-On Installation
  • Limited Lifetime Warranty
  • Fits 2004-2008 5.4L F-150s
  • For SuperCab with a 6.5 ft. Bed and SuperCrew with a 5.5 ft. Bed
Deep Muscular Sound. Lean back in your seat and enjoy a deep, clean exhaust tone with the SLP Loudmouth II Dual Side Exit Cat-Back Exhaust System installed on your 2004-2008 5.4L F-150. Channeling exhaust through bullet mufflers and a fast-flowing 2.5” tubing system, the SLP Loudmouth II provides a burly all-American rumble at cruising or idle speeds and an aggressive note when accelerating. Its wide-open design frees up about 10 ft/lbs of Torque and 10 HP, while the extra long polished and slash cut exhaust tips add a lean, mean styling cue to your favorite machine.

Built Durable. High grade stainless steel is used throughout the SLP Loudmouth II Cat-Back, protecting it not only from outside rust and discoloration but also from corrosive fluids condensing out of the exhaust stream on its inner walls. Constructed of 2.5" stainless, the Loudmouth II features mandrel bends that don't constrict the tubing's diameter. The highly polished bullet mufflers bear the stamped SLP logo and can be switched out for noisier Loudmouth resonators if so desired (sold separately). The 3.5” polished exhaust tips can be rotated to deliver your own personalized preference.

Handy Bolt-On Setup. Installation of the SLP Loudmouth II Cat-Back Exhaust requires no cutting, welding, or other modifications, since the system is engineered as a bolt-on application. You can use hand tools to install and a full set of hardware is included.

Application. This SLP Loudmouth II Dual Side Exit Cat-Back Exhaust System is designed to fit 2004 to 2008 5.4L F-150s with the following cab and bed sizes.
  • SuperCab with a 6.5 ft. Bed
  • SuperCrew with a 5.5 ft. Bed

Fitment: 2004 2005 2006 2007 2008 Details

What's in the Box
  • (1) Y-Assembly
  • (2) Bullet Mufflers
  • (2) Tail Pipe Assembly
  • (6) Clamps
  • (2) Polished Tips
Installation Info
Will it fit my F-150?

Customer Photos

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2 Questions / 1 Answers

Ask a Question

Does this product include exhaust hangers or would fabrication be needed?


  • This exhaust will not include hangers and modification will be required for proper installation and fitment.


Helpful (0)

can this be made to fit my 2004 standard cab 6.5 box 4x4 with the 5.4 motor or can I just purchase a muffler to fit the cat-back system I have now ?


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Customer Reviews (1) Write a Review

Overall Rating 1.0

out of 5 stars

Installation Time:Afternoon

  • Loudness / Volume 3 3
  • Exhaust Note 5 5
  • Fit & Finish 4 4
  • Bang For Your Buck 5 5

  • 1/5

    Installation Time: Afternoon

    June 11, 2017


    the product is nice but be sure to buy long tube headers as well to get under the frame


    Year: 2005 Submodel: 5.4L V8 XLT

    Helpful (0)

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