o/r H installed
Thread Starter
4th Gear Member
Joined: Dec 2007
Posts: 1,503
From: Maryland
RE: o/r H installed
I have the LM1s for that reason, zero restriction. But now w/ no cats...it's like too zero I guess. Until 1800 rpm it sounds good, then the flood gates open and it screams something raspy as hell. But then, I want low restriction. Was considering the Super 44s b/c their description sounded like they flowed the best for chambered and the no cats was enough flow gain, but I guess the LM2s are my best bet.
6th Gear Member
Joined: Feb 2007
Posts: 11,302
From: North Carolina
RE: o/r H installed
Magnapacks and LM2s are very simliar in design. Both are basically high quality glasspacks. In other words, imagine a straight piece of pipe with tons of holes drilled in it. Around that drilled pipe is packing, fiberglass or whatever they use. Overall of that is the outer shell of the muffler. Chambered mufflers have actual baffles, not good for flow.
So, do you not like the SLP1s at all? I had them on my LS1 GTO with an X-PIPE and they sounded sweet. Very tuned type sound. I wonder if the H-pipe makes them sound rough?
If you are looking for a really good sound only, do the chambered muffs. If you want flow, but not so obnoxious, try the LM2 or magnapacks.
Are you looking to sale those LM1s?
So, do you not like the SLP1s at all? I had them on my LS1 GTO with an X-PIPE and they sounded sweet. Very tuned type sound. I wonder if the H-pipe makes them sound rough?
If you are looking for a really good sound only, do the chambered muffs. If you want flow, but not so obnoxious, try the LM2 or magnapacks.
Are you looking to sale those LM1s?
Thread Starter
4th Gear Member
Joined: Dec 2007
Posts: 1,503
From: Maryland
RE: o/r H installed
Thought you might ask that. I got the LM1 catback b/c I wanted ultimate flow, and LOUD. Catback as the only mod, they sound f..king awesome. Probably sound f..king awesome with a midpipe w/cats. But I'm telling ya, w/ pretty much just straight pipe they just ain't sounding quite right. Those resonators are resonating right up inside my Mach. I mean, they go nuts at 1800 rpm. Anyway, I could sell them or just trade someone for a muff thattoned it down a half a notch, but still flowed really well......wutcha got?
6th Gear Member
Joined: Feb 2007
Posts: 11,302
From: North Carolina
RE: o/r H installed
My car has flows, only thing is, I'm not 100% sure if they are just welded in, or an actual Flowmaster Catback. I've been under the car plenty, but without a set of calipers, its hard to tell if its 2.5 inch pipe or 2.25. Trade ya?
Thread Starter
4th Gear Member
Joined: Dec 2007
Posts: 1,503
From: Maryland
RE: o/r H installed
Well, I'd have to think about that. First, you need to find out if yours are 2.5" or not. If theyare, I'd need to see how long of a total distance I'd need you to cut yours off to fit properly in the SLP catback sleeves that the muffs slide into. If your flows are welded in that pretty much means they are 2.25" b/cthat's what thestock pipe is, and they wouldn't work if it was 2.5" anyway b/c I think thewelds would get in the way of me trying to slip them into the sleeves of my catback.The 3 pc. setup of the SLP catback is why alot of peeps buy them, b/c it's so easy to slip muffs in and out. Let me know if your's are 2.5" and if they're aren't any bulky welds.By the way, do ya still have cats?
6th Gear Member
Joined: Feb 2007
Posts: 11,302
From: North Carolina
RE: o/r H installed
Well, whats throwing me off is the quality of the weld and not knowing the diamter. Most muffler shops do a halfass job, but the weld on mine is exceptional. I'll get some calipers and measure the pipe diameter and get back with you. Better yet, I'll get some picstoo. If we traded, Iwe would have to trade the entire cat-back since mine is a one piece. That actually leads me to think mine is stock with weld-ins.
Na, I don't have cats. Its pretty loud, but not nearly as loud as yours. I've heard some Loudmouth clips and those things are insane! Honestly, you would be much better off just swapping mufflers instead of the whole deal. Just thought I'd throw it out there, lol!
Na, I don't have cats. Its pretty loud, but not nearly as loud as yours. I've heard some Loudmouth clips and those things are insane! Honestly, you would be much better off just swapping mufflers instead of the whole deal. Just thought I'd throw it out there, lol!
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From:
RE: o/r H installed
Wow, lots of misinformation in this thread. First of all, leaving the rear o2 sensors unplugged is perfectly fine. With an sct or diablo the tuner TURNS OFF the rear o2 sensors, not changes the voltage. Rear O2 sensors are used only to check for cats, not for an A/F mixture. MIL eliminators change the voltage of the rear 02 sensors, tuners simply turn them off.
Secondly, go ask any reputable performance shop if flowmasters are going to give you less performance than a straight through muffler such as the LM series on an NA car producing 300 hp. The answer is no. The HP difference between flows and a completely straight through muffler is going to be 1-2hp on our cars. Even though the flow of air is being changed to not as efficient, it's not enough change to dramatically change your hp or performance. That's why a lot of people tell you to get a muffler that you like the sound of and not to worry about brand, or what he/she said types of gossip.
Secondly, go ask any reputable performance shop if flowmasters are going to give you less performance than a straight through muffler such as the LM series on an NA car producing 300 hp. The answer is no. The HP difference between flows and a completely straight through muffler is going to be 1-2hp on our cars. Even though the flow of air is being changed to not as efficient, it's not enough change to dramatically change your hp or performance. That's why a lot of people tell you to get a muffler that you like the sound of and not to worry about brand, or what he/she said types of gossip.
6th Gear Member
Joined: Feb 2007
Posts: 11,302
From: North Carolina
RE: o/r H installed
Not true. If your rear O2 sensors are turned off, (where and how would the tuner go about turning them off anyway, they dont have an on/off) how is the PCM going to determine the voltage/resistance change it recieves from the primary O2 sensor and the secondary? If, hypothetically, you turned off/unplugged the rear sensor, the PCM is still getting a primary O2 reading and is searching for the secondary thats never going to turn up. Doesn't make sense. I know the rear sensor alone doesn't determine the A/F mixture, but the front doesn't work independently either. The primary and secondary sensors work as a unit in other words. Mils don't change the voltage, they keep it the same using resistors. The voltage doesn't have to be exact, just within a given range.
True, chambered mufflers don't rob a ton of HP over Straight thru mufflers considering no cat-back is giving you much power to begin with, but if you consider that a cat-back might give you 5-7rwhp, then that 1-3 hp difference that the chambered robs you of is a pretty good amount considering the additional low gain.
Using a 7rwhp gain.......SLP= 7rwhp gain
Flows= 4rwhp gain 6rwhp if there was a 1 HP difference (very unlikely)
True, chambered mufflers don't rob a ton of HP over Straight thru mufflers considering no cat-back is giving you much power to begin with, but if you consider that a cat-back might give you 5-7rwhp, then that 1-3 hp difference that the chambered robs you of is a pretty good amount considering the additional low gain.
Using a 7rwhp gain.......SLP= 7rwhp gain
Flows= 4rwhp gain 6rwhp if there was a 1 HP difference (very unlikely)
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Joined: Feb 2006
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From:
RE: o/r H installed
ORIGINAL: Stone629
Not true. If your rear O2 sensors are turned off, (where and how would the tuner go about turning them off anyway, they dont have an on/off) how is the PCM going to determine the voltage/resistance change it recieves from the primary O2 sensor and the secondary? If, hypothetically, you turned off/unplugged the rear sensor, the PCM is still getting a primary O2 reading and is searching for the secondary thats never going to turn up. Doesn't make sense. I know the rear sensor alone doesn't determine the A/F mixture, but the front doesn't work independently either. The primary and secondary sensors work as a unit in other words. Mils don't change the voltage, they keep it the same using resistors. The voltage doesn't have to be exact, just within a given range.
True, chambered mufflers don't rob a ton of HP over Straight thru mufflers considering no cat-back is giving you much power to begin with, but if you consider that a cat-back might give you 5-7rwhp, then that 1-3 hp difference that the chambered robs you of is a pretty good amount considering the additional low gain.
Using a 7rwhp gain.......SLP= 7rwhp gain
Flows= 4rwhp gain 6rwhp if there was a 1 HP difference (very unlikely)
Not true. If your rear O2 sensors are turned off, (where and how would the tuner go about turning them off anyway, they dont have an on/off) how is the PCM going to determine the voltage/resistance change it recieves from the primary O2 sensor and the secondary? If, hypothetically, you turned off/unplugged the rear sensor, the PCM is still getting a primary O2 reading and is searching for the secondary thats never going to turn up. Doesn't make sense. I know the rear sensor alone doesn't determine the A/F mixture, but the front doesn't work independently either. The primary and secondary sensors work as a unit in other words. Mils don't change the voltage, they keep it the same using resistors. The voltage doesn't have to be exact, just within a given range.
True, chambered mufflers don't rob a ton of HP over Straight thru mufflers considering no cat-back is giving you much power to begin with, but if you consider that a cat-back might give you 5-7rwhp, then that 1-3 hp difference that the chambered robs you of is a pretty good amount considering the additional low gain.
Using a 7rwhp gain.......SLP= 7rwhp gain
Flows= 4rwhp gain 6rwhp if there was a 1 HP difference (very unlikely)
Here's the phone number for bamachips (205-302-0231) , a reputable shop that does a lot of work with custom and canned tunes. Try and tell him that he can't turn off the rear 02 sensors, because guess what? He automatically turns them off for EVERY tune he sells.
It's also funny how in my 04 gt I had that I didnt plug up the rear o2 sensors and they were TURNED OFF in my custom tune.
6th Gear Member
Joined: Feb 2007
Posts: 11,302
From: North Carolina
RE: o/r H installed
Turns them off with every tune eh? Keep telling yourself that.
You need to tone the attitude down a bit, this is a discussion about exhausts, so don't come in here throwing out phone #'s to Bamachips like their going to tell me something I don't already know.
What you're telling this guy to do, is to half-*** rig his exhaust by not plugging in his rear O2s. You're not the only one to ever have a car tuned. I've had to have 2 cars Dyno Tuned multiple times because they both had headers and exhaust, one was later Procharged. The tuner couldn't tune my GTO until the next day because he ran out of bungs.He also went way out of his way to fabricate some extensions for me since I didn't bother to order them myself. Now, why in the world would a guy that does this for a living do a thing like that?Maybe you should call Carolina Auto Masters and ask them. I've been doing this stuff for awhile too, so plz don't tell me that I know nothing about the answers I'm giving out.
You can reply however you like. I'm not going to keep going back and forth with you. This section manages toremain the only peaceful section on this forum, and I'm not going to be the one to end that.
You need to tone the attitude down a bit, this is a discussion about exhausts, so don't come in here throwing out phone #'s to Bamachips like their going to tell me something I don't already know.
What you're telling this guy to do, is to half-*** rig his exhaust by not plugging in his rear O2s. You're not the only one to ever have a car tuned. I've had to have 2 cars Dyno Tuned multiple times because they both had headers and exhaust, one was later Procharged. The tuner couldn't tune my GTO until the next day because he ran out of bungs.He also went way out of his way to fabricate some extensions for me since I didn't bother to order them myself. Now, why in the world would a guy that does this for a living do a thing like that?Maybe you should call Carolina Auto Masters and ask them. I've been doing this stuff for awhile too, so plz don't tell me that I know nothing about the answers I'm giving out.
You can reply however you like. I'm not going to keep going back and forth with you. This section manages toremain the only peaceful section on this forum, and I'm not going to be the one to end that.