Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

• Loudness / Volume 4.768293 4.8
• Exhaust Note 4.804878 4.8
• Fit & Finish 4.835366 4.8
• Bang For Your Buck 4.75 4.8

• 5/5

  Installation Time: Afternoon

  May 22, 2018

  Great Product.

  Worth every penny. Only took a few hrs to install and all parts fit perfectly.

  DerrickH

  Year: 2003 Submodel: GT

  Helpful (1) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Afternoon

  May 22, 2018

  Slp loudmouth

  I am very pleased with this exhaust,it has a rich throaty sound and that's what I was looking for! I couldn't be happier!

  Gmanrocks

  Year: 2004 Submodel: GT

  Helpful (0) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 1/5

  May 21, 2018

  Defected part!

  Everything was great until the driver side went on. The tailpipe end that connects to the over axle pipe were the same diameter. The tailpipe end should of been wider but it wasn't and the bracket for the muffler broke..So I had to spend $200 to get the pipes welded...Highly disappointed and I talked with an americanmuscle rep and they wanted me to ship the whole exhaust back and get a new one or order a new one take the one piece out and send it back for a refund...which makes no sense at all..I was not going to have my car down for 2-4 weeks as I am working overseas....

  edwardd

  Year: 2004 Submodel: GT

  Helpful (0) Thanks for your input!

  • Loudness (Volume) 2

    2

  • Exhaust Note 2

    2

  • Fit & Finish 5

    5

  • Bang for your Buck 1

    1
• 4/5

  Installation Time: Less than 1 Hour

  May 15, 2018

  SLP loudmouth

  Fit was great easy also and was quick to put on.The sound is amazing good for your money best purchase

  RobertS

  Year: 2004 Submodel: Mach 1

  Helpful (0) Thanks for your input!

  • Loudness (Volume) 4

    4

  • Exhaust Note 4

    4

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Afternoon

  May 15, 2018

  Very nice system

  The product has a very clean look and a nice rumble at 2k rpm but if you want it to be loud would highly suggest getting a X pipe.

  BrendenD

  Year: 2004 Submodel: GT

  Helpful (0) Thanks for your input!

  • Loudness (Volume) 4

    4

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Afternoon

  May 12, 2018

  Slp catback

  Slp has brought beast mode out of my 04 stang. I really like my slp loudmouth, even though my neighbor's not so so much!!!

  CharlesS

  Year: 2004 Submodel: GT

  Helpful (0) Thanks for your input!

  • Loudness (Volume) 4

    4

  • Exhaust Note 4

    4

  • Fit & Finish 4

    4

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Less than 1 Hour

  May 06, 2018

  Very Loud!

  This exhaust is very loud and sounds great. Definitely a noticeable difference from the factory flow masters.

  AngelR

  Year: 2001 Submodel: GT

  Helpful (0) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Less than 1 Hour

  May 02, 2018

  Catback

  They sounded good when I put them on with my stock hpipe but when I threw on the off road hpipe it sounds like a race car no lie. Sweet set up if you like it loud.

  HarrisonP

  Year: 2004 Submodel: GT

  Helpful (1) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  April 27, 2018

  Loud, Crisp, No rattle, fits perfect!

  I dont know why people have had issues with the clamps, they seemed to work perfectly fine. Everything fit very well and the clamps just made it a quick and easy process. I got the whole thing done in about an hour with a lift, since with a jack these would be an absolute pain. The sound is insane! My long tube headers and off road x pipe really make these scream!

  MichaelS

  Year: 1999 Submodel: GT

  Helpful (2) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Shop Install

  Installation Cost: $100-$250

  April 12, 2018

  Rooooar

  Man O Man are these bad boys nasty!! I didn’t even need new pipes cuz I already had some aftermarket ones on the car. But I ordered these and she growls like a beast!! That 3.5 in tip makes that rear end look really good

  TayR

  Year: 2002 Submodel: GT

  Helpful (1) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Less than 1 Hour

  April 02, 2018

  Bassani Catted X SLP LM1

  Install was a breeze. All parts fit perfectly; extremely impressed that the tailpipes came in two pieces which allowed for optimal alignment. I did use a lift, also used an exhaust jack to keep it all in place while cinching everything down. Is it loud? Yeah. But thankfully with the high flow cats - it prevents the annoying popping sound under acceleration that you'll hear from people going with off road exhaust, or if they're using a sub-par quality midpipe. Expect a slightly deeper tone on start up, the sweet spot is right around 2400 RPM - 2800 RPM and then obviously WOT is amazing too. I've had plenty of people stop, flag, and ask what I'm running. You will not be disappointed.

  ATU14

  Year: 2004 Submodel: Mach 1

  Helpful (1) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Afternoon

  March 29, 2018

  Cobra loudmouth

  I was a little worried about it being too loud with my off road Mac Pro chamber but it actually sounds amazing. My neighbor’s hate me but I also get a lot of compliments. It’s deep but absolutely scream’s when you get on it even a little. Overall it’s an amazing exhaust system. Would definitely recommend to anyone. Thanks American musle for Quik delivery.

  LynxT

  Year: 2001 Submodel: Cobra

  Helpful (1) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 3/5

  Installation Time: Less than 1 Hour

  March 20, 2018

  Great sound horrible clamps

  Quick and easy install on the lift took about 20 mins to install tightened everything down and headed Dow the road exhaust fell apart due to the clamps not clamping so I bought the good clamps and haven’t had a problem figured for the money u spend you would get all quality stuff but not true

  KevinS

  Year: 2000 Submodel: GT

  Helpful (1) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 4

    4

  • Bang for your Buck 3

    3
• 5/5

  Installation Time: Afternoon

  March 16, 2018

  Glad I went with the SLP LM1

  I am pretty pleased with the LM1 system. I went back and forth for a while on which system to get. I wanted something louder than the Spintech catback I was running, but I didn't want something too raspy or obnoxious sounding. I was nervous because I know the LM1 can sound pretty raspy sometimes. However, I find that most of the time when they sound raspy it is when they are paired with an off-road x-pipe. I am running Bassani mid length headers, a Bassani x-pipe with one set of high flow cats, and now the LM1 system. It sounds great. Not too raspy at all. Nice tone and noticeably louder under acceleration than my last catback. Fit and finish was nice. One thing I particularly liked was the modular design of the system. It allows for a great deal of adjustability. This ended up being more important that I though because of the panhard bar I am running. It is a tight squeeze getting the pipes to clear the axle, fuel tank, and the panhard bar. This system allowed for more points of adjustment than most systems would. I was able to get it in without any clearance issues. It was extremely close, but it worked great.

  Blown4valveGT

  Year: 2002 Submodel: GT

  Helpful (4) Thanks for your input!

  • Loudness (Volume) 4

    4

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 4/5

  Installation Time: Less than 1 Hour

  March 10, 2018

  Great exhaust

  This an amazing exhaust i didnt think it was going to be nearly as loud as it actually is no video serves this kit justice.

  AnthonyA

  Year: 2004 Submodel: GT

  Helpful (2) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 4

    4

  • Fit & Finish 4

    4

  • Bang for your Buck 4

    4
• 5/5

  Installation Time: Less than 1 Hour

  March 08, 2018

  Sounds great and easy to install!

  I had my doubts about how it would sound on my mustang gt, but I am not disappointed!! It sounds amazing, and was a lot easier to install than I first thought. Great exhaust, and quickly shipped. Will definitely buy from this site again!

  Sarahg

  Year: 2002 Submodel: GT

  Helpful (2) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 4

    4
• 5/5

  March 04, 2018

  INSANE!

  This thing makes that 4.6 sound like a monster! 10/10 would recommend.

  BryceB

  Year: 2003 Submodel: GT

  Helpful (3) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  Installation Time: Afternoon

  February 25, 2018

  Great Product

  The fitting was perfect and only took me about 2 hours or so just because my h-pipe bolts had to be cut. My only complaint is, i wish they were a little louder.

  AlecS

  Year: 2003 Submodel: GT

  Helpful (2) Thanks for your input!

  • Loudness (Volume) 4

    4

  • Exhaust Note 4

    4

  • Fit & Finish 5

    5

  • Bang for your Buck 4

    4
• 5/5

  Installation Time: Afternoon

  February 19, 2018

  Slp

  I love my slp I have it with a bbk offroad x yes it’s loud but everyone loves it and it sounds amazing

  OlindoH

  Year: 2001 Submodel: GT

  Helpful (2) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5
• 5/5

  February 12, 2018

  Loudmouth

  Adds an aggressive sound. Not overly loud during idle so the neighbors won't hate you too much. Definitely a good buy.

  Aaron

  Year: 2004 Submodel: GT

  Helpful (3) Thanks for your input!

  • Loudness (Volume) 5

    5

  • Exhaust Note 5

    5

  • Fit & Finish 5

    5

  • Bang for your Buck 5

    5