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SLP Loudmouth Cat-Back Exhaust (98 GT, Cobra)

Market Price $572.95 You Save 4% ($23.00)

$549.95

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  • Item 23006
  • MPN# M31011

In Stock Ships same business day. Choose options to add to cart

Features & Details

  • Rich, Throaty Exhaust Tone
  • Loudmouth "Shotgun" Race Resonators Included
  • Versatile Modular Design
  • 2.5" 409 Stainless Steel Tubing
  • 3.5" Polished 304 Stainless Steel Tips
  • Fits 1998 GT and Cobra Mustangs
More Power and Sound. This SLP system includes SLP's infamous Loudmouth "shotgun" race resonators that offer virtually no exhaust flow restrictions to free up more horsepower and to produce the most aggressive sound possible.

Modular Design.   SLP's unique modular design allows you to quickly and easily switch out the mufflers or resonators to suit your driving needs. Along with the included resonators, the Loud Mouth system is compatible with all SLP mufflers and resonators including the bullet-type Loud Mouth II and the traditional-style PowerFlo Muffler.

Superior SLP Construction. This SLP Cat-Back system is made from mandrel bent 2.5" 409 stainless steel tubing for its excellent non-restrictive flow characteristics and long life. The system ends with a brightly polished 304 stainless steel 3.5" tips, that are electro-marked with the distinctive SLP logo, giving a great finishing touch and a show quality look.

Application. Designed to be a direct bolt on, this SLP Loudmouth catback will bolt straight up to the factory Mid-Pipe without any modifications required on the 1998 GT or SVT Cobra Mustangs to give it a rich, throaty sound.

Fitment: 1998 Details

What's in the Box
Hardware included:
  • (4) stainless steel band clamps
Installation Info
Tech Specs
Cat-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 2.5" Tip Size: 3.5"
Muffler Type: Straight-through Fitment: 1998 GT and Cobra Mustangs
Will it fit my Mustang?
  • Cobra - 98
  • GT - 98

Most Helpful Reviews

5/5
Blastin. your ears off.

The most important word is LOUD. just how i like it. bolted up real nice. to x-pipe. good clearance from the ground. everything fit good and tight. nice idle. nice cruz sound. then step on it and your ...

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Helpful (3)

5/5
Blastin your ears off.

very good catback sys can really feell the power kick in at 5000 and above. fit and finish very good. it screams get out my way when you step on it. just how i like it. Nice.

Helpful (3)

Overall Rating 5 out of 5 stars
Read All 17 Reviews

Customer Photos (11) Submit Your Photo

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1 Questions / 1 Answers

Ask a Question

Will these fit with long tube headers and a shorty x pipe or will I have to get a mid x pipe?

JT93

  • They will fit. The long tubes and shorty x are the same as factory manifolds and mid pipe.

    YellowSnake98

    Good Answer (0) (0)

Answer This Question I need this answered (0) (0)

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Customer Reviews (17) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Less than 1 Hour

  • Loudness / Volume 5 5
  • Exhaust Note 4.666667 4.7
  • Fit & Finish 5 5
  • Bang For Your Buck 4.333333 4.3



  • 5/5

    May 07, 2010

    Blastin. your ears off.

    The most important word is LOUD. just how i like it. bolted up real nice. to x-pipe. good clearance from the ground. everything fit good and tight. nice idle. nice cruz sound. then step on it and your breaking windows. setting off cars and maybe house alarms' lol cuz its 'LOUD' first day i took it for a test run got pulled over. in friends driveway. you mite see me on youtube lol. that was a warning. second day got pulled over got a warning ticket. lets see how many tickets i get this yr. lol

    John s.

    Helpful (3) (0)

  • 5/5

    May 07, 2010

    Blastin your ears off.

    very good catback sys can really feell the power kick in at 5000 and above. fit and finish very good. it screams get out my way when you step on it. just how i like it. Nice.

    John s.

    Helpful (3) (0)

  • 5/5

    July 17, 2010

    wow...

    Well, bought this with a catless x pipe. pretty sure open headers would be quiter... lol. but i get complements from everyone, just sounds so mean. give in to temptation and get it. so worth it.

    Chad

    Helpful (3) (1)

  • 5/5

    Installation Time: Afternoon

    May 14, 2015

    Great Exhaust.

    Fit perfect. Quality is top notch. Love the look. If you want loud then ive never had a louder exhaust.

    vnmsgt

    Year: 1998 Submodel: Cobra Orlando

    Helpful (1) (0)

  • 5/5

    May 15, 2009

    Great Catback

    Had some flowmaster 40 mufflers, then decided 2 get a whole SLP catback, and loved the sound. Many compliments, and the tips look great. Doesnt sound like every other mustang, and has a nice tone, and you could tell theres hp gain.

    Sutriz

    Helpful (1) (0)

  • 5/5

    November 22, 2008

    Worth every penny

    This is a great product. I am very impressed with the power gain and sound. Great if you are looking to make your Mustang more aggressive.

    micah D.

    Helpful (1) (0)

  • 5/5

    February 24, 2008

    BadASS

    WOW!!!! They sound so bad@$$ going down the road!!! Great HP Gains you can feel the difference I am guessing 10 - 20 hp increase. Some minor weilding needed but other than that not hard to install.

    Nick Z.

    Helpful (1) (0)

  • 5/5

    November 14, 2009

    Great Product

    Definitely a major upgrade from my old flows I had. The tips are beautiful!

    Jorge

    Helpful (0) (1)

  • 5/5

    November 04, 2009

    Nice Upgrade

    Replaced my Flow 40's for The Slp exhaust. Wasn't disappointed at all! Great Sound! Well worth the investment.

    Jorge

    Helpful (0) (1)

  • 5/5

    July 23, 2008

    Loudmouth catback 98 GT

    Awsome sound! Easy install and noticeable extra power. Too much fun! Highly recommend this kit.

    Phill

    Year: 1998 Submodel: GT

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    May 16, 2016

    Great Exhaust

    Took 1 Hour to install with Jack stand in the rear. Simple hand tools. Sounds outstanding with my Catted Bassani X. Tips are awesome, everything slides right together. Great Job SLP and American Muscle for get shipped fast.

    Drew

    Year: 1998 Submodel: Cobra

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    February 12, 2012

    SLP Loudmouth

    Exhaust sounds great and has an awesome tone. Really aggressive. Sounds amazing with my upr catted x pipe. Install was pretty easy just had to bend the pipes a little for a perfect fit. Thanks American Muscle

    Gary27

    Year: 1998 Submodel: GT

    Helpful (0) (0)

  • 5/5

    May 15, 2011

    Very loud with great tone

    If your thinking about it just buy it. Though it is very loud when you step on the gas, if you keep your foot out if it, this kit will give you a very deep hollow and throaty rumble, but stuff it and it starts screaming. All in all a great set of pipes, though if your not into making the most noise possible, you could go with the LM 2 system, its a little more toned down and reasonable. A friend of mine heard me revving at a car show, he said "it just gave me a headache, that think is stupid loud!"

    Chase

    Year: 1998 Submodel: GT

    Helpful (0) (0)

  • 5/5

    October 09, 2010

    SLP rocks

    Well all i can say is that SLP headers, x-pipe, and catback are very amazing in all areas. My mustang still has that rich deep sound of a mustang which i was very concern about, but not with SLP. My buddy has a 98 camero with another system on and had to put cut out on to be louder. So yes SLP Loudmouth are very loud. otherwise very easy to install and it was worth very penny.

    Ryan Cawley

    Year: 1998

    Helpful (0) (0)

  • 5/5

    April 15, 2010

    slp loudmouth catback

    Great product. It really roars when you open it up.

    Dan Pompe

    Helpful (0) (0)

  • 5/5

    February 11, 2010

    YOU WANT LOUD!

    THIS IS THE FIRST AND ONLY EXAUST YOU WILL EVER NEED FOR YOUR MUSTANG..2 THUMBS UP!

    JEREMY

    Helpful (0) (0)

  • 5/5

    February 14, 2009

    SA-WEET

    Dude, this catback alone made my mustang sound so sick. I cant wait to hear it with o/r x pipes and shorty headers.

    Sean

    Helpful (0) (0)

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