Review & Install Video
Hey guys, Stephanie with americanmuscle.com, and this is my review and then install of the MMD V-Series Side Exit Cat-back that comes with a new set of Rocker Panels fitting your 2015 and up GT Mustang. We're gonna be talking about a few different things with this exhaust today, but mainly we'll talk about the sound of the cat-back and the install. The install for this is easy, it's a one out of three wrenches in the difficulty meter, even though there is something a little bit different with this cat-back but I'll get more into that later.
The V-series cat-back from MMD is gonna be for the S550 GT owners out there that are looking for something different and outside of the box. It's gonna be for someone looking for a loud and deep tone with a soft hint of raspiness to it for someone that's looking for something visually different. This is a perfect option for the guys that are looking for something aggressive and loud.
This cat-back is going to eliminate the factory resonator and replace it with a Resonator Delete X-Pipe that leads down the high flow straight through Flowmaster Mufflers. And this setup is gonna give a sound that I consider to be one of the louder options as you guys already heard from the sound clips. So, basically what's happening here is that MMD took their knack for a different styling and worked with Flowmaster to create a cat-back that has both visual style and a great sound.
We talk about sound first and style second. Like I mentioned earlier, this cat-back is going to eliminate the restrictive factory resonator and replace it with an X-pipe. Now, an X-pipe typically makes for a louder system that'll produce more power later on the RPM band than an H-pipe would. X-pipes are generally raspier as well, and they force the exhaust to cross streams to even out flow. I'd say that this system has muffled raspiness to it. This is obnoxiously raspy because the mufflers calm it down.
Removing this resonator is going to have a bunch of performance benefits. We'll get sound and power improvements and even some weight benefits since a simple X here is gonna weigh less than the factory resonator, and that's just a nice little bonus that you get from swapping over to an aftermarket system like this one.
The cat-back is gonna keep the two-and-a-half-inch diameter, and you're also looking at a full stainless steel mandrel bent cat-back with this system with black coated side exit stainless steel tips. As always, the main component of a cat-back is gonna be the mufflers. They're the heart of the system, and they play a large role in both the sound and performance benefits. In this case, we're looking at a set of high flow straight through Flowmaster Mufflers that give a powerful and aggressive sound from the cat-back.
There's a touch of raspiness to this system, but I think it does a good job of balancing volume and raspiness to create a sound that's flattering to the GT. The first impression that I got from this cat-back is that it has a deep and loud sound. I know you can hear the cat-back is deeper than the factory exhaust, and as you start climbing the RPM, I don't think the deepness of the tone goes away.
It definitely reminds me of a muscle car tone, but what's nice is that it keeps the loudness without getting distorted like a lot of other systems tend to do. I don't hear any sound distortion with this cat-back, which I thought I might considering the X-pipe and the louder volume level.
I'd place this cat-back towards the top of the pack when it comes to volume. It's not a quiet cat-back by any means. It's actually on the louder side in my opinion. Call it a solid four on the loudness meter with one being very quiet and five being the loudest out there. If you're not looking for something this aggressive, then there are a ton of other cat-back options on the site that you can check out.
If we wanna talk about the styling some, you can see right here that this is a different setup. The cat-back starts out normally with your X-pipe that's two-and-a-half inch, sort of bought up to your factory system. Then after the mufflers, it's gonna turn and exit out of the side, right before the rear tire and after the door.
Now, because this is a side-exit exhaust, you're gonna need some new side skirts to work with this. MMD has you covered though. It include side skirts that are gonna go over the top of your factory side skirts. MMD calls these side skirts OEM quality, and I'd have to agree with that after seeing them here and seeing them installed on the GT. These do look OEM. They're made from ABS, and they're an unpainted black. Now, you can paint these if you really want to, but ABS doesn't usually tend to paint the best. And like I said, they do look OEM, so it's not like you have to paint them in my opinion to make them look good.
And one other thing that MMD does for you here is they include some block off plates for you. Since your exhaust won't be existing through rear anymore, you're gonna have cut outs in your stock valance that would be empty, which would just look weird. So the block off plates would cover those cut outs. You'd be surprised at how much of a difference his makes styling-wise, and I'm happy to see MMD thinking of everything here and giving you guys a complete kit.
When it comes to price, I was honestly surprised, but surprised in a good way. We all know that cat-backs for the S550 are damn expensive, especially for a high-end stainless steel system. With this cat-back coming with the extras of the hardware for the install and the side skirts and the block out plates, I thought it was gonna be even more expensive. You're gonna expect to pay close to the $1,300 mark for this cat-back, which isn't the most expensive cat-back out there. With the sound, the materials and the extras you're getting here, I'd say that this is a good deal.
As far as the install goes, even though this is a little bit of a different setup, you're gonna be looking at an easy one out of three wrenches on the scale when we look at difficulty. All that you're really gonna need is a socket set, a drill since there is some small drilling, and a lift would certainly make things easier, but the job can be done on jack stands as well. You're gonna be removing the exhaust from the resonator bag, so an extra set of hands can make things easier for you here.
You can start by removing your rear hangers since you won't be needing those anymore any way. Then you're gonna remove the exhaust from the resonator bag, and then once that's off, you're gonna need to address your side skirts.
Your mud flaps will come off, and because the new skirts install with 3M tape, you're gonna want to make sure that your factory side skirts are really clean, so you can get a good surface for the tape to bond to. Once the surface is ready, you can install your new side skirts. Next, you'll need to remove your rear wheels so you can get to your inner wheel well. The edge of the MMD side skirt and the factory side skirt will need to be lined up so you can drill a small hole and clip the two together.
After that's done, you just have your cat-back to install. You can piece the system together on the car if you want to. So, you start with your X-pipe and then your mufflers. Once you get to the tail pipes, you need to install the hanger mounts on to the hangers. These tail pipes are going to hang from the rear sub frame, which isn't a bad thing, but I will say that this causes the system to be close to the ground and a little low-hanging, so just note to be careful with ground clearance. Once you have the system pieced together and all lined up, you can tighten everything down and you're good to go.
Overall, the MMD V-series side exit cat-back is a cat-back that offers both sound and appearance of [inaudible 00:07:18]. This is a loud and aggressive cat-back, and it's gonna replace the factory resonator with an X-pipe that'll ultimately drop some weight and open up both exhaust flow and power. The cat-back features high flow straight through mufflers that produce a good amount of volume and sound without being over bearing.
As always, you can check this cat-back out online some more for yourself. And for all things Mustang, keep it right here at americanmuscle.com.
MMD Styling with Aggressive Sound.
MMD worked hard with Flowmaster to develop and create an extremely high quality Side Exit Cat-Back Exhaust that will not only give your V8 powered Mustang a sporty aggressive look, but a deep aggressive sound as well.
MMD V-Series Side Skirts.
Modern Muscle Design manufactures their V-Series Side Skirts from OEM quality high impact thermoformed acrylonitrile butadiene styrene (ABS) plastic for superior durability. These black Side Skirts feature a factory style grained texture for an OEM appearance and to increase longevity against rock impacts from daily driving. MMD V-Series Side Skirts are simple to install using the supplied 3M doubled-sided automotive bonding tape.
V-Series Side Exit Cat-Back.
Manufactured by Flowmaster, this Side Exit Cat-Back is made from 16 gauge 409 stainless steel for superior strength and long lasting corrosion resistance. Featuring mandrel bent 2.5 inch diameter tubing, an X-Pipe and a set of straight through mufflers, this V-Series Cat-Back will significantly out flow the restrictive factory exhaust system for a bump in power. MMD's Cat-Back includes a pair of black coated stainless steel dual exhaust tips that exit through the included side skirts for aggressive looks and sound. This Cat-Back is a direct bolt-on replacement for your Fastback GT's factory exhaust system with no cutting or extra modifications required.
Bumper Filler Plates Included.
When designing their V-Series Side Exit Cat-Back Exhaust Modern Muscle Design thought of everything. MMD includes a pair of stylish satin black block off filler plates to cover the exhaust tip holes left in your bumpers lower rear valance. Seeing that the Base GT and the Performance Pack GT feature different rear bumpers please be sure to select your specific model from the options above when ordering.
This Modern Muscle Design V-Series Side Exit Cat-Back Exhaust is designed to fit 2015-2017 Fastback GT Mustangs equipped with the DOHC 5.0L V8 Coyote engine. This kit does not
fit Convertible models.
If you are having trouble determining what style bumper your Mustang is equipped with please refer to the comparison image above.
CA Residents: Warning: California's Proposition 65
- What's in the Box
- (1) X-Pipe
- (2) Mufflers
- (1) Right Tailpipe Assembly
- (1) Left Tailpipe Assembly
- (2) Block Off Plates
- (1) Driver Side Side Skirt
- (1) Passenger Side Side Skirt
- (1) Hardware Pack
- (4) 2-1/2" Clamps
- (4) Rubber Mounts
- (2) 3/8” x 1 1/2” Bolts
- (2) 3/8” x 1” Bolts
- (4) 3/8” Hex Nuts
- (2) 3/8” Flat Washers
- (4) 3/8” Lock Washers
- Installation Info
Installation Time: (approx) 2 Hours
Difficulty Level:Light to Moderate mechanical skill required.
- Tech Specs
Cat-Back Exhaust Specifications
||409 Stainless Steel
||Tip Material :
||Black Coated Stainless Steel |
||2015-2017 GT Fastback|