Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

How to tell between LM1 &2

Thread Tools
 
Search this Thread
 
Old Mar 24, 2011 | 08:33 PM
  #1  
BrdOPry's Avatar
Thread Starter
On The Tree
iTrader: (1)
 
Joined: Jul 2010
Posts: 191
Likes: 0
From: Columbus, Ohio
Default How to tell between LM1 &2

I know I have an SLP setup of some sorts. But not sure which it is..any easy way to tell? The salesman said he thought the previous owner said it was an LM1 but I'm not sure. Any real easy ways to tell?

Thanks guys.
Reply
Old Mar 24, 2011 | 08:42 PM
  #2  
LS1Silverado05's Avatar
TECH Addict
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (41)
 
Joined: Jun 2005
Posts: 2,370
Likes: 1
From: Classified
Default

im pretty certain the LM2 is a little larger muffler... but VERY similar so without really seeing inside the muffler its hard
Reply
Old Mar 24, 2011 | 09:28 PM
  #3  
rob69zombie's Avatar
12 Second Club
iTrader: (7)
 
Joined: Feb 2009
Posts: 1,138
Likes: 2
From: Havelock, NC
Default

Depends on what dies when you drive by; if squirrels fall out of trees when you drive by you have a LM2. If you can down the freeway and kill deer on the side of the road you have a LM1. lol I have a lm1 now I'm gonna make quieter or take off for a dual/dual soon.
Reply
Old Mar 24, 2011 | 09:48 PM
  #4  
The Mighty Texan's Avatar
TECH Addict
iTrader: (4)
 
Joined: Apr 2010
Posts: 2,200
Likes: 2
From: Longview,TX & Tricitys,WA
Default

Isn't there a part # on the muffler or something? Very similar exhausts indeed though.. ^
Reply
Old Mar 25, 2011 | 04:15 AM
  #5  
hawiianpwr's Avatar
Launching!
20 Year Member
iTrader: (2)
 
Joined: Aug 2004
Posts: 266
Likes: 0
From: Omaha
Default

I'm sure you would be able to knock on it and if it sounds hollow then its probably a LM1
Reply
Old Mar 25, 2011 | 04:33 AM
  #6  
Summerwolf's Avatar
TECH Fanatic
15 Year Member
iTrader: (3)
 
Joined: Jul 2006
Posts: 1,060
Likes: 1
Default

Look through the muffler....if it is hollow it is an LM1, if it has perforated walls, it is an LM2.
Reply
Old Mar 25, 2011 | 06:03 AM
  #7  
shepss217's Avatar
TECH Enthusiast
iTrader: (5)
 
Joined: Feb 2009
Posts: 574
Likes: 0
Default

no part # on the muffler, if it's absolutely ear drum shattering it's probably a lm1 lm2 isnt as loud but still loud
Reply
Old Mar 25, 2011 | 06:23 AM
  #8  
BOBS99SS's Avatar
Captain Double Post
iTrader: (2)
 
Joined: Jun 2010
Posts: 1,615
Likes: 2
From: Elyria Ohio
Default

Lol I have a lm1 ,isn't the lm2 resonator a lil larger
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Mar 25, 2011 | 06:39 AM
  #9  
Summerwolf's Avatar
TECH Fanatic
15 Year Member
iTrader: (3)
 
Joined: Jul 2006
Posts: 1,060
Likes: 1
Default

Originally Posted by BOBS99SS
Lol I have a lm1 ,isn't the lm2 resonator a lil larger
Most of the LM1/LM2 exhausts have the same muffler dimensions. To know for sure you have to look through the muffler to see if it has any baffling.
Reply
Old Mar 27, 2011 | 07:40 PM
  #10  
Raise's Avatar
TECH Addict
20 Year Member
iTrader: (31)
 
Joined: Dec 2003
Posts: 2,152
Likes: 0
From: Virginia Beach, Va
Default

Originally Posted by Summerwolf
Look through the muffler....if it is hollow it is an LM1, if it has perforated walls, it is an LM2.
What that guy said
Reply
Old Mar 27, 2011 | 07:43 PM
  #11  
Blackhawk777's Avatar
TECH Resident
 
Joined: Feb 2006
Posts: 855
Likes: 0
From: Omahaish. Nebraska.
Default

Easiest way of telling without tearing it apart (and yes i do know from experience, cause i've had both) is the actual tone. The lm1 has more of a straight pipe cackle to it through the rpm range and will pop and backfire like crazy if you let off the gas at higher rpm, where the lm2 is more bass heavy and alot more controlled as far as the extra "noise" from the packing and baffles. If your car sounds more straight piped and cackles alot, you got the lm1.
Reply
Old Mar 28, 2011 | 08:58 AM
  #12  
BrdOPry's Avatar
Thread Starter
On The Tree
iTrader: (1)
 
Joined: Jul 2010
Posts: 191
Likes: 0
From: Columbus, Ohio
Default

Well my buddy has a LM1 and says mine isn't as loud as his in the cabin, but I think different. Looks like a have a reason to get under the car now lol
Reply




All times are GMT -5. The time now is 05:53 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE