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Thread: Magnaflow muffler questions

  1. #1
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    Magnaflow muffler questions

    The exhaust on my car is in ok condition but was a little more umph

    the muffler will be 3 inch in and 2 outlets
    Should I put a staright pipe plus resonator
    magnaflow 2 into 1 cat staight to muffler?
    Thanks

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    Re: Magnaflow muffler questions

    You can delete the resonator no problem, with whatever muffler you want. Should sound nice.


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    Re: Magnaflow muffler questions

    I went with hi-Flo cats, y-pipe 3" to a magnaflow muffler where the resonator used to live, then a smaller magnaflow muffler for the back box. But I did the full treatment. You can see the setup in my profile.

    If you want to do "less", a simple resonator delete to the muffler might be fine. But where you do get to 3"?

    maw
    Last edited by maw1124; 06-26-2018 at 05:10 PM.

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    Re: Magnaflow muffler questions

    I think on the factory stuff, the resonator outlet / muffler inlet with the 3-bolt flange is ~70mm diameter, or a little under 3". I'd need to double check though.


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    Re: Magnaflow muffler questions

    this is what I had in mind what do you guys think?
    1-new cat <magnaflow 94057> http://www.hottexhaust.com/Magnaflow_94057
    then 3 inch all the way to magnaflow 12198 <14in> or 12288 <18> http://www.hottexhaust.com/Magnaflow_12198
    then the square pipes https://www.ebay.com/itm/23281203396...m=232812033963

    or

    keep stock cats and remove resonator and add the magnaflow muffler plus pipes
    thanks guys

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    Re: Magnaflow muffler questions

    I think I need to implement an “Unlike” button per that bagged 124 with the Lambo mirrors in the previous eBay link.

    Sigh.

    That photo seriously defaces our forum.....
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    Re: Magnaflow muffler questions

    Its grose
    I got this muffler tips

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    Re: Magnaflow muffler questions

    Quote Originally Posted by Ertech View Post
    or... keep stock cats and remove resonator and add the magnaflow muffler plus pipes
    thanks guys
    ^^^

    This...

    maw

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    Re: Magnaflow muffler questions

    Quote Originally Posted by gerryvz View Post
    I think I need to implement an “Unlike” button per that bagged 124 with the Lambo mirrors.

    Sigh.

    That photo seriously defaces our forum.....
    Bags are awesome although the mirrors are quite awful.


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    Re: Magnaflow muffler questions

    If bagging is your thing, then MBWorld is probably a better fit, or 190Revolution.net.

    Just sayin’. most folks here prefer to preserve the value of their .036s. I don’t think it’s a topic that would see much receptive/productive discussion here.

    It’s a free country though. I certainly wouldn’t censor the topic.

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  20. #11
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    Re: Magnaflow muffler questions

    Quote Originally Posted by Ertech View Post
    keep stock cats and remove resonator and add the magnaflow muffler plus pipes
    thanks guys
    KEEP THE STOCK CATALYSTS! Don't replace good factory cats. The aftermarket stuff is all junk by comparison. The factory cats are good for over 400hp, you aren't going to gain any power by replacing them, you'll just be poorer.


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    Re: Magnaflow muffler questions

    so took a closer look. the aftermarket cats go from 2 to 1 < 3 inch> , the stock cat go from 2 to 2 so I will need a" y"after the stock cat that cost 80$ . aftermarket cat cost 110$ and has a built in "Y".
    should I still keep stock cats and purchase a "y" or aftermarket cat and save on the "y"?
    hope I am clear lol

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    Re: Magnaflow muffler questions

    Read post #11 again...


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  26. #14
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    Re: Magnaflow muffler questions

    Thanks , I get the stock ones are way better
    Since I got new info like the cost of the Y pipe is almost the same as an aftermarket cats and my cats have 130k
    Thaught your conclusion would be different
    all good will keep the stock cats as per your always amazing advice
    thanks

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    Re: Magnaflow muffler questions

    Well, see if they are rattling. Jury is still out (mine is, at least) on whether cats are a time or mileage thing. My guess is it’s some complex algorithm that takes into account those two variables and several others we can’t think of. Mine were done (rattling) at under 65k miles, but can I say there was never any 100 Octane run through there? No. So I say if they rattle, replace them. But I get that you might have to “re-do” this later if you don’t do it now. Also, I’m not sure if 3” is too big, but if it’s after the cats, it’s probably not a problem. I forget what year is your car, but ‘92’s didn’t even have O2 sensors downstream of the cats (IIRC), so cats may be optional. All of this may be “off strategy”. If all you’re thinking about is sound, why not just cut it before the resonator and install your Magnaflow back box and call it a day? Fewer components, less gray matter, less money, more sound.

    And... this makes it easier to replace the stock cats (with whatever you choose) if and when the time comes.

    maw

    P.S. sound clip here...https://youtu.be/WUaiWYgX8xs I’ve heard several of these with all sorts of exhausts, from Magnaflow to RENNtech. IMO, they all sound basically the same — the engine is the engine and the length of pipe is the same. The real difference to me is whether you keep (or replace) the resonator, or not. Notice how that’s the biggest piece of the system. So given that you’re changing the muffler, the only other choice to make for me, sound wise, is whether you want to keep it quiet (some form of resonator) or “unleash the beast”. I went for the former.
    Last edited by maw1124; 06-27-2018 at 07:04 PM. Reason: Sound clip, FWIW

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    Re: Magnaflow muffler questions

    I listened to GSXR and kept my stock cats as well. I have a custom setup with a cutoff valve. If you go under my owners thread you can see it there. Ill attach a link of how it sounds for you

    https://youtu.be/HuJFqsofFq0

    Im planning on removing my cats and doing all custom work before the cats as well as the stock pipes are flattened in areas and I would like it to be a little louder.


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  32. #17
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    Re: Magnaflow muffler questions

    Quote Originally Posted by maw1124 View Post
    Well, see if they are rattling. Jury is still out (mine is, at least) on whether cats are a time or mileage thing. My guess is it’s some complex algorithm that takes into account those two variables and several others we can’t think of. Mine were done (rattling) at under 65k miles, but can I say there was never any 100 Octane run through there? No. So I say if they rattle, replace them. But I get that you might have to “re-do” this later if you don’t do it now.
    Yes - maw is correct, check for any rattle. If the cats are rattling, then they will need replacement soon, if not overdue. Whack the cats hard with your fist, you'll know right away if they are bad. The honeycomb inside breaks apart and keeps disintegrating over time. But... if no rattle, and there's no indication they are plugged, leave them alone.


    Quote Originally Posted by maw1124 View Post
    Also, I’m not sure if 3” is too big, but if it’s after the cats, it’s probably not a problem.
    Also correct - after the cats, this is close to factory size. No problemo.


    Quote Originally Posted by maw1124 View Post
    I forget what year is your car, but ‘92’s didn’t even have O2 sensors downstream of the cats (IIRC), so cats may be optional.
    All years 034/036 (and the E60) used the identical catalyst pipe, and all had the O2 sensor upstream of the cats. However, 1992 models spec'd a different part number O2 sensor vs 93-up. Early & late O2's are interchangeable, and appear functionally equivalent, I have no idea why MB did this. There is a slight difference in the metal shroud that covers the sensor, but that's it. Maybe it was related to the WOT enrichment deletion from 93-up. (??)


    Oh, and I'll with the comment above that "they all sound basically the same". You're not going to make the M119 sound like a Ford Voodoo engine, or an M120. Even a RENNtech 6.0 with tubular headers and full custom exhaust front to rear ($10k total) doesn't sound drastically different than a 500E with Y-pipe an Remus.



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    Re: Magnaflow muffler questions

    I used a Magnaflow muffler in place of my Time Valve Y-Pipe to cut down on the noise inside of the car. I took a brand new Magnaflow muffler that an exhaust shop installed for me and did a lousy job to a Stainless Steel exhaust fabricator in Costa Mesa, CA. Next door to BURNS STAINLESS STEEL SYSTEMS. Anyway to make a long story short. Chris jigged up my stock resonator and then cut out the resonator leaving the connectors in the jig. He then welded in the Magnaflow muffler. I believe it was for a Camero originally. Attached are some pics of the job. I installed it back on the car myself. NOTE that either part is bolt up to the stock connections.

    Some pics are of the Y-Pipe installation the rest are the Magnaflow. To do it over I would use the Magnaflow muffler with the INTERNAL X per Jono's statement on cutting down the drone inside of the car.

    Lately I have been contemplating re-installing the Y-Pipe since I have a new KIA Optima beater to drive everyday (it's real quiet inside). I only drive the 500E myself and if anybody rides with me they would be car guys. My wife rarely rides in it so noise is not that big of an issue anymore.
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    Last edited by TerryA; 06-28-2018 at 10:24 AM.
    Terry

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    Re: Magnaflow muffler questions

    hi Terry do you have a back picture of the car so I can see tailpipes ?
    thanks

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    Re: Magnaflow muffler questions

    Quote Originally Posted by Ertech View Post
    hi Terry do you have a back picture of the car so I can see tailpipes ?
    thanks
    The back box is a RennTech off of an SL500 or SL600 I had to move the hanger to the center of the muffler. When I got it the hanger was offset to one side. You won't find those tips unless you get a RennTech muffler. BTW it's straight thru. You can see thru it.

    NOTE: I tried to delete one of the DBL pics and could not. Can an Administrator do it for me please.
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    Last edited by TerryA; 06-28-2018 at 01:09 PM.
    Terry

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  39. #21
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    Re: Magnaflow muffler questions

    Wow love them
    was not to sure about putting pipes under the bumper since I did not want to cut it
    Thanks guys for all your help

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    Re: Magnaflow muffler questions

    I think a magnaflow "muffler as a resonator" is a great idea, which I'd never think of. Fortunately someone thought of it for me. For reasons TerryA states, if I had it to do over again, I might replace that resonator with a straight pipe.

    maw

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    Re: Magnaflow muffler questions

    Terry! You are such a dewd!



    Awesome stock plate. being that its a CA 3, are you the original owner?


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