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Thread: Mufflers

  1. #1
    Join Date
    Sep 2004
    Location
    cromwell ct
    Posts
    746

    Default Mufflers

    Any one have any strong opinions about a muffler. Low restriction, good sound control? Probably going to run a 2-2.5 inch pipe. It's for a BMW Z3 1.9 Liter. Thanks

  2. #2
    Join Date
    Jan 2001
    Location
    Atlanta, GA usa
    Posts
    677

    Default

    I run a flowmaster and it has kept my loud 240sx under the DB limits. It seems to flow well and there is nothing in it to "burn out". So it should last you. It can be a bit heavy though.

    ------------------
    Tristan Smith
    Buffalo's Southwest Cafe
    ITA Nissan 240sx #56

  3. #3
    Join Date
    May 2001
    Location
    IT.com "First Loser" Greensboro, NC USA
    Posts
    8,607

    Default

    I had a Magnaflow street muff put on the Golf and I quite like it. DL-1 acceleration data suggests strongly that the car is faster with it than with a downturn after the cat. It's loud enough to hear but is a long way from the sound limit.

    K

  4. #4
    Join Date
    Jul 2004
    Location
    Raleigh NC
    Posts
    3,682

    Default

    There are some other ways to approach it, that is, you can have the best of both worlds.

    One way to do it is to install a dump before the muffler and if you want to use it unbolt the plate that blocks the dump and give it a whirl. In this fashion you can check performance of open setup vs. muffler. Best place to check this would be on a dyno though since you could eliminate those pesky variables such as driving.

    Kirk you ought to set your system up so that the cat can be unbolted at the track if you are wishing to run the cat. I did a few of my drag cars that way and, at least with the cars I was running, they were definitely faster without cats and mufflers. However, you might be in the RPM range were you are depending on some torque from the motor and the lack of back pressure takes some of that away.

    There are other solutions too, such as manual dump valves and electrical dumps so that you can vary the system to your choosing.

    ------------------
    Ron Earp
    NC Region
    Ford Lightning Tow Beast
    RF GT40 Replica
    Jensen-Healey ITS
    1/2 a 260Z ITS - Zero

  5. #5
    Join Date
    Oct 2001
    Location
    Oregon City OR.
    Posts
    1,550

    Default

    I have dynoed a lot of muffers over the years. I am pretty stuck on the Dynomax bullet mufflers if you need to knock no more than 3 DB off of the open system. If you need more than that the dynomax oval race muffler will bring most cars under 99db but it like the flowmaster is a little heavy.

  6. #6
    Join Date
    Feb 2003
    Location
    Raleigh, NC USA
    Posts
    425

    Default

    If you can stand the cost, the best mufflers hands down come from Coast Fabrication... They can build you anything and there work is second to none and very low weight !

    http://www.coastfab.com/

    ------------------
    Fred Alphin
    #92 Hankook Tire SSB VW GTI VR6
    BMW 325i ITS ( 2006 ? )

    [This message has been edited by Fastfred92 (edited March 11, 2005).]

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