Review & Install Video
Hey, guys, Stephanie with AmericanMuscle.com here with my review of the SLP Loudmouth II Axle-back Exhaust for 2015 to '16 Fastback GTs.
My first impression of this axle-back is that it offers a deeper, more reserved muscle car sound. Around 2,000 to 4,000 rpm, the system does get louder, and it increases in sound as you get into those higher rpms, but it maintains the deepness and throaty quality. It doesn't get raspy at all. Even from inside the car, the axle-back sounds deep and has no drone, which is perfect for a nice cruise or good sound quality from light to light in town. And, luckily, the sound can be there when you want it to be, you've just got to step on it a little bit harder.
Keep in mind that this is an axle-back, so you'll be keeping all of your cats and your stock resonator. Now, down the road, you can always change out your resonator for another mid-pipe option and enhance the sound of the axle-back even more, and that's one of the nice things about an axle-back. It offers room to grow and change for different things like mid-pipes, off-road setups, or headers.
I'm going to rate it as a two on the loudness scale because while it is deep, it's not the loudest thing out there on the axle-back market. If you're looking for loud from an axle-back, there are other systems out there that are sure to give you what you're looking for. In fact, SLP does have a muffler delete option for you guys out there that are looking for loud.
So, we're looking at 2 ½" manual-bent stainless steel tubing with 4" polished stainless steel tips, rocking the SLP name here, and a pair of straight-through mufflers at one of the most budget-friendly prices that we're seeing out there on the market for the S550 GT and from a brand that's known for their exhaust products. I'd say that this is a good deal here if you're looking for a louder but more tame muscle car sound from an axle-back.
Install-wise, if you don't know by now, if you're installing an axle-back, you're going to be doing some cutting, and this axle-back is no different. It's a standard cut-and-clamp design that we're used to seeing with other axle-backs, and for that reason, I'm going to stick with what I said in the past and call this a two out of three wrenches on the scale. Time-wise, it's not really going to take too long to install, probably about an hour or so, but you do have to be careful when you're cutting. And remember that this system is not compatible with convertibles. I still just recommend a fresh sawzall blade and some eye protection, just to make sure everything goes smoothly.
Wrapping this up, the SLP is one of the inexpensive options on the axle-back scale when we compare it to the rest of the market, and if you're looking for a deep and throaty but more civilized exhaust tone, then this would be a good option for you. The straight-through mufflers are going to wake your 'Stang up some and provide you with a little extra sound and the option to further change your exhaust down the road. As always, feel free to check out the full line-up of axle-back options, here at AmericanMuscle.com.
Sporty Muscle Car Sound.
Give your Coyote powered S550 Fastback Mustang a sporty muscle car tone with only minimal harshness by installing a SLP Loudmouth II axle-back exhaust system from AmericanMuscle. The Loudmouth II not only enhances the sound of your late model Mustang, but it also enhances performance by drastically reducing back pressure for an increase in horsepower and torque.Stainless Steel Construction.
Manufactured from 2.5" diameter mandrel-bent stainless steel tubing for its excellent flow characteristics, this SLP Loud Mouth II exhaust system features a pair of straight-through performance mufflers that end with highly polished 4" dual wall exhaust tips for intimidating muscle car looks and sound.Cut & Clamp Installation.
The installation of this Axle-Back Exhaust requires cutting and removing the factory muffler assemblies, and clamping the new muffler assemblies in place. Clamps and instructions are provided.Application.
This SLP Loudmouth II Axle-Back Exhaust system is specifically designed to fit 2015-2017 GT Fastback Mustangs only. Cutting of factory exhaust is required for installation. Not
compatible with convertibles.
CA Residents: Warning: California's Proposition 65
- What's in the Box
- (2) Axle-Back Assemblies
- (2) Polished Tips
- (4) Clamps
- Installation Info
Installation Time: (approx) 1 Hour
Difficulty Level:Light to Moderate mechanical skill required.
- Tech Specs
||Tip Material :
||Polished 304 Stainless Steel |
||2015-2017 GT Fastback|
- Will it fit my Mustang?
Not compatible with Convertibles due to different bracing