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Old 11-17-2012, 01:51 PM   #1
theredgoat
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New LM1 catback

I bought some lm1s and got them installed last week with an x pipe. I really like the tone but they are just not quite loud enough. I'm thinking about ditching the cats to make it louder. I know it will make it a little more raspy but will it make it sound like crap? I don't mind some rasp but I don't want to ruin the whole sound of the car. How bad will the drone be as well? I've got a guy that will cut them out and replace them with tubing for $100. I'm holding off on headers for about a year because I'm getting a motorcycle and that will tie up some money for a while. I don't have to worry about emissions till April. I'm getting a vararam for Christmas so I'm going to get it tuned after that and tune out the rear o2s. Any imput is appreciated.
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Old 11-17-2012, 04:18 PM   #2
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If you want loud just take out the LM1s and replace with straight pipe. No cats will make it louder, but not that much more.
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Old 11-17-2012, 07:58 PM   #3
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I ran a welded in x pipe and straight pipes for a while. It was loud but sounded amazing from outside the car. Keep the cats until you decide to do headers. Then go with a high flow catted system or catless. Be wary catless will have alot of rasp and high flow cats really clean up the sound and dont quiten the car too much.
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Old 11-18-2012, 10:22 AM   #4
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Thanks guys. I still can't make up my mind. Anyone else?
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Old 11-18-2012, 10:53 AM   #5
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i have kooks long tubes and catted mids. i love it.. no rasp
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Old 11-19-2012, 03:26 AM   #6
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First step in exhaust modding should be long tube headers, they sound so much better than cast iron manifolds and give you power along with the improved sound. Then start tinkering with the cat back, X-pipe and mufflers.
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Old 11-19-2012, 07:09 AM   #7
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Quote:
Originally Posted by 87LC2...View Post
First step in exhaust modding should be long tube headers, they sound so much better than cast iron manifolds and give you power along with the improved sound. Then start tinkering with the cat back, X-pipe and mufflers.

Wish i knew that, now stuck with magnaflow cat back....
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Old 11-19-2012, 08:28 AM   #8
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I wold just wait for the headers if you want louder. No point in having a car with a loud bark and no bite.
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Old 11-19-2012, 09:08 AM   #9
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Originally Posted by NITROS COBRA/GTO...View Post
Wish i knew that, now stuck with magnaflow cat back....

Add some headers and come back. I have stainless works long tubes with catless mids and a magnaflow catback and it sounds incredible. I also have Heads, MS4 cam and a fast intake. Sounds Nascar like at wot.

Their is a difference btw being loud and sounding good. Lm1 with headers and engine mods sound like a machine gun in a garbage can.

Last edited by big reg; 11-19-2012 at 09:10 AM.
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Old 11-19-2012, 09:36 AM   #10
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Add some headers and come back. I have stainless works long tubes with catless mids and a magnaflow catback and it sounds incredible. I also have Heads, MS4 cam and a fast intake. Sounds Nascar like at wot.

Their is a difference btw being loud and sounding good. Lm1 with headers and engine mods sound like a machine gun in a garbage can.

I agree with you totally, but again you have heads and cams. I am not going to do ls3 head swap and cam for awhile. Plus i do have a 416 in the garage? So for now I do need the headers and mids. Going to need them anyway for my build. Also have access to a dyno. Want to dyno every step, so that i can give others a rough guess on what parts make hp wise. Going to do the 416 and whipple 4.0L last.
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Old 11-19-2012, 10:17 AM   #11
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I had flowmaster 44s and a resonator delete, it sounded great and was pretty loud inside the car. Switched out the flowmasters with straight pipes, and put an X pipe in place of the resonator and it is much louder outside the car, but quieter inside the car somehow (might have to do with the X pipe). I've ordered electric cutouts and once they are installed, I expect the car to sound downright disrespectful...

You can't go wrong with straight pipes. Very cheap and efficient. If you do not like it you can always add an X or H pipe to tweak the sound (also very cheap). All in all you can have a very loud, nice sounding muscle car for about $250.
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Old 11-19-2012, 10:24 AM   #12
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Straight pipes almost always sound like crap. JMO. No matter what the crossover is.
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Old 11-19-2012, 10:51 AM   #13
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long tubes + spintech = loud.
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Old 11-19-2012, 12:07 PM   #14
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http://www.ls1gto.com/forums/showthread.php?t=337497
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Old 11-19-2012, 12:52 PM   #15
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Quote:
Originally Posted by Koebot...View Post
Straight pipes almost always sound like crap. JMO. No matter what the crossover is.


People like you are what kept me from doing straight pipes earlier. I've heard this over and over, but with the straight pipes and X pipe I only get compliments and questions on which full exhaust I've got. Sounds amazing. I'm sure without a crossover it wouldn't sound too great though, just loud.
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Old 11-19-2012, 01:36 PM   #16
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Quote:
Originally Posted by ZeroTraction...View Post
People like you are what kept me from doing straight pipes earlier. I've heard this over and over, but with the straight pipes and X pipe I only get compliments and questions on which full exhaust I've got. Sounds amazing. I'm sure without a crossover it wouldn't sound too great though, just loud.

I'm not knocking you for doing it. Plenty of people do. It's "just my opinion" as I stated. We all have varying preferences on what looks good, sounds good, smells good, etc.
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Old 11-19-2012, 02:00 PM   #17
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slp

On my 05 I had a decent came all long tubes high flow cats and lm1 cat back and it was one of the nicest sounding cars I ever heard and it was loud as hell.... sounded perfect and it DID NOT sound like straight pipes
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Old 11-19-2012, 02:19 PM   #18
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Want loud?

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Old 11-19-2012, 02:30 PM   #19
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thanks for all the input. I think I am going to keep it how it is until I can get headers and mids. now i just have to try and save close to $1000 for headers, mids and a tune.
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Old 11-19-2012, 06:45 PM   #20
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Quote:
Originally Posted by ZeroTraction...View Post
People like you are what kept me from doing straight pipes earlier. I've heard this over and over, but with the straight pipes and X pipe I only get compliments and questions on which full exhaust I've got. Sounds amazing. I'm sure without a crossover it wouldn't sound too great though, just loud.

Yes, the mustang crowd is probably giving you compliments. The adult world, however, knows it sounds like dog shit
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Old 11-20-2012, 02:56 AM   #21
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thanks for all the input. I think I am going to keep it how it is until I can get headers and mids. now i just have to try and save close to $1000 for headers, mids and a tune.

Pacesetter coated L/T's and mids are half that price.
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Old 11-20-2012, 04:34 AM   #22
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Or keep an eye out in the for sale section. If you have that kind of patience.
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Old 11-20-2012, 12:14 PM   #23
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I was in the exact same predicament you were in. Had LM with X-pipe. "Wasn't loud enough" says me. Put Kook's SS LT's and catless mids on. "Ok way too loud and unbearable drone at 1900-2100 rpm" said me afterwards.

Don't do it. LM1 sounds pretty decent with the stock manifolds and resonater.
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Old 11-21-2012, 10:23 AM   #24
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Pacesetter coated L/T's and mids are half that price.

Aren't pacesetters cheaply made compared to the other brands?
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Old 11-21-2012, 10:38 AM   #25
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^ yes they are.
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Old 12-02-2012, 12:52 PM   #26
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http://www.youtube.com/user/devinthe...?feature=watch

Visit my old youtube page for a bunch of vids of my old car.

It had a LM1 w/xpipe, Kooks 1 3/4 longtubes and no cats.
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Old 12-02-2012, 02:40 PM   #27
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Originally Posted by redgoat420...View Post
http://www.youtube.com/user/devinthe...?feature=watch

Visit my old youtube page for a bunch of vids of my old car.

It had a LM1 w/xpipe, Kooks 1 3/4 longtubes and no cats.

Wow that's really loud but sounds good! How bad was it inside the car?
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Old 12-02-2012, 04:05 PM   #28
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Quote:
Originally Posted by 87LC2...View Post
First step in exhaust modding should be long tube headers, they sound so much better than cast iron manifolds and give you power along with the improved sound. Then start tinkering with the cat back, X-pipe and mufflers.

Definitely truth.

Although i did the xpipe/muffler mod first just because i wanted sound, i knew i wouldnt get the HP gains i would have from doing long tubes. Even though i probably gained 1hp, i love the sound. I can just imagine what long tubes will do to my setup lol

Not to mention i did the work myself. No way im going to tackle a header job after reading the "how to" lol. Plus worrying about breaking a bolt? No thanks.

After my car gets inspected around february im having long tubes installed though. I cant wait.
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Old 12-04-2012, 12:11 PM   #29
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It was pretty droney in low rpm's. It was a bit much but I got used to it pretty quickly and it never bothered me.
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