• Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-

SLP Loudmouth I or II??????

  • Thread starter Thread starter TRIBALMAN23
  • Start date Start date Feb 21, 2009

TRIBALMAN23

New Member
Feb 23, 2008
49
0
0
Feb 21, 2009
#1
  • Feb 21, 2009
  • #1
I already have and off-road H-pipe, so no cats! and just have stock mufflers on my car currently, just pipe up to the mufflers and it sounds good but........

I have looked all over youtube and still can't figure out what is better.
With my O/R H-pipe is the SLP Loudmouth I or the SLP Loudmouth II better?
What are the differences between the two?
Can you post a video or explain what each combo would sound like or describe the differences?

Wouldn't be the same if I didn't do either one and just ran straight pipe all the way to the bumper? What are the Pros and Cons to this?

Any info would greatly be appreciated!!!

Again I would like to see the differences in the 05-09 mustang models, I think the results would be different on earlier models.

Thanks!!!!!!
 

bigcat

start with the upper hole, and if more traction is
May 1, 2005
3,015
1
79
7200 feet
Feb 21, 2009
#2
  • Feb 21, 2009
  • #2
no such thing as I and II. they have loudmouth and powerflo only.
 

TRIBALMAN23

New Member
Feb 23, 2008
49
0
0
Feb 21, 2009
#3
  • Feb 21, 2009
  • #3
HUUUUMMMMM OK i saw youtube vids that had them listed that way and other forum sites that described them that way also.

So what are the differences with O/R H-pipe and and the loudmouth and powerflo?
 

pkarol1

New Member
Feb 4, 2007
0
0
0
Lawrenceville, NJ
Feb 21, 2009
#4
  • Feb 21, 2009
  • #4
lm1's don't have mufflers, powerflos do.
my buddy used to have an o/r h and lm1's on his 07 gt, and it was INSANELY loud. sounded pretty much just like my car (i have an o/r h and lm1 catback exhaust, the only difference is lm1's come with resonators for 99-04 mustangs).
with powerflos you'll get a nice deep tone, it's not gonna be as loud as lm1, but it still will be pretty damn loud
 

bigcat

start with the upper hole, and if more traction is
May 1, 2005
3,015
1
79
7200 feet
Feb 21, 2009
#5
  • Feb 21, 2009
  • #5
loudmouths are just straight pipe with tips. the powerflos are round body mufflers.

It will be obnoxiously loud with O/R pipe and loudmouths. I have no idea what the powerflos sound like.

check out SLPs website for details on either setup, but i would not do loudmouth and O/R H.

SLP ONLINE
 
E

erzats

New Member
Nov 7, 2008
74
0
0
Feb 21, 2009
#6
  • Feb 21, 2009
  • #6
I just installed the axle back power flos on a catted h pipe bullitt. This combo is plenty loud .With off roads and loudmouths you might as well just run open headers.
 
O

o0Dan0o

Founding Member
Feb 8, 2001
485
1
0
Feb 21, 2009
#7
  • Feb 21, 2009
  • #7
SLP has the "loud mouth" and "loud mouth II" resonators/mufflers, the I series are just resonators (a larger chamber, but empty) the II series are basically strait through mufflers.

SLP Performance Parts, Inc. - SLP Modular Exhaust Systems see the bottom.
Dan
 

pkarol1

New Member
Feb 4, 2007
0
0
0
Lawrenceville, NJ
Feb 22, 2009
#8
  • Feb 22, 2009
  • #8
o0Dan0o said:
SLP has the "loud mouth" and "loud mouth II" resonators/mufflers, the I series are just resonators (a larger chamber, but empty) the II series are basically strait through mufflers.

SLP Performance Parts, Inc. - SLP Modular Exhaust Systems see the bottom.
Dan
Click to expand...

that would be right for previous mustang generations.
slp only makes loudmouth1 and powerflow axleback systems for 2005+
like i said before, lm1 are just straight pipes, and powerflos come with mufflers

lm1:
Mustang SLP Loudmouth Axle-Back Exhaust (2005+ Mustang GT)

powerflo:
Mustang SLP Power-Flo Axle-back Exhaust (05+ GT & 07-08 GT500) at AmericanMuscle.com - Free Shipping!
 
O

o0Dan0o

Founding Member
Feb 8, 2001
485
1
0
Feb 22, 2009
#9
  • Feb 22, 2009
  • #9
I was just clarifying for the OP what people mean when the say loudmouth I or II.
Dan
 

NastyStang113

New Member
Sep 12, 2008
1,567
1
0
Florida
Feb 22, 2009
#10
  • Feb 22, 2009
  • #10
o0Dan0o said:
I was just clarifying for the OP what people mean when the say loudmouth I or II.
Dan
Click to expand...

I understood you. I guess a lot of people don't think you can splice mufflers into an exhaust system or that no one ever does it ...
 
You must log in or register to reply here.

Similar threads

L
Is catback worth it over axle backs?
  • Lorencarson
  • May 15, 2025
  • 2005 - 2014 S-197 Mustang -General/Talk-
Replies
2
Views
695
2005 - 2014 S-197 Mustang -General/Talk- May 15, 2025
89ripper
S
1998 Mustang Gt Rattling sound, cannot locate. Video included
  • studerman1
  • Mar 31, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
8
Views
249
1996 - 2004 SN95 Mustang -General/Talk- Apr 1, 2026
studerman1
S
M
Too much for me to repair in my current housing situation
  • My Drama Magnet 04 Gt
  • Apr 1, 2026
  • The Welcome Wagon
Replies
8
Views
314
The Welcome Wagon Apr 14, 2026
Noobz347
G
Quiet my 2015 GT on the cheap
  • gsrblack
  • Feb 12, 2025
  • 2015 - 2023 (S550) Mustang -General/Talk
Replies
6
Views
787
2015 - 2023 (S550) Mustang -General/Talk Apr 16, 2025
gkomo
S
Engine 2003 Mach 1 Automatic Upgrades assistance
  • SJK1417M1AT
  • Sep 25, 2025
  • SN95 4.6L Mustang Tech
Replies
3
Views
305
SN95 4.6L Mustang Tech Dec 21, 2025
01SVTvertt
0
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?