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Thread: Exhaust recommendations

  1. #26
    Join Date
    Sep 2011
    Location
    Henderson, NV
    Posts
    9
    My Cars
    1991 BMW 850i Coupe
    Thanks for your insights and recommendations. What did you use for the two catalytic converters up front? I see on the internet that Borla makes "supposedly" OEM type replacements for about $675 a side. I want to make sure that I don't have a problem with the infamous "check engine" light or fail to meet annual mandatory Nevada DMV emission checks. Thanks again.....

  2. #27
    Join Date
    Sep 2011
    Location
    Henderson, NV
    Posts
    9
    My Cars
    1991 BMW 850i Coupe
    Oops... the catalytic converters were also Magnaflow... 93684 and 93685 for about $600 each "with" an extensive tubing or pipe "setup" included in the price. Is this what you would recommend? In effect, a Magnaflow replacement system for all FIVE major components?

  3. #28
    Join Date
    Oct 2010
    Location
    Deutschland
    Posts
    279
    My Cars
    1998 BMW 740i
    Those Magnaflow units are OEM replacements. I originally went with the Magnaflow universal 53956 catalytic converters, but they couldn't stand up to the temperatures the FI produced. I am currently running a test pipe while I source a suitable replacement that doesn't take up too much space.

  4. #29
    Join Date
    Sep 2011
    Location
    Henderson, NV
    Posts
    9
    My Cars
    1991 BMW 850i Coupe
    Another question regarding muffler choice and selection... Magnaflow has a Street Series stainless steel muffler with dual square DTM tips (2.25" Center ID, 3" Dual OD, 14" length) for about $210 each... did you consider or would these be mufflers TO consider since our 850 cars had dual square exhaust outlets (but, with a slightly staggered configuration). Thanks again for your help?

  5. #30
    Join Date
    Sep 2011
    Location
    Henderson, NV
    Posts
    9
    My Cars
    1991 BMW 850i Coupe
    The Magnaflow Street Series stainless steel mufflers referenced above with the dual square tips on each muffler are the Magnaflow 14804 model for about $210 and which "appear" to have the potential to "look" something like our current square tip exhaust tips that were OEM on our 1991 BMW 850s "when new". What are your thoughts on the potential use of these mufflers as part of a Magnaflow package of two up front cat converters, a middle resonator and two mufflers? Thanks again for your help!

  6. #31
    Join Date
    Jan 2008
    Location
    Indianapolis, IN
    Posts
    2,365
    My Cars
    93 850Ci, 09 Caddy SRX
    Quote Originally Posted by 325isBoosted View Post
    I have a 95 840ci and the stock exhaust just isn't cutting it for me. Its damn near silent and I want to hear that v8. I would like a nice sounding idle and throaty acceleration with minimal drone at highway speeds, nothing crazy or obnoxious just something that gives it a voice and improves flow. I have seen plenty of youtube clips of custom exhaust but no one ever lists the mufflers, piping size etc. I'm not looking to buy an off the shelf system, mostly due to the cost. If I can narrow down a decent muffler and xpipe combo with the right size pipe there are quite a few affordable shops in the area i trust to do the work. As for piping size I also want to allow room to breath with the jaguar supercharger setup so thinking I may want to bump it up from stock, currently still in the mock up phase so not anywhere near installation yet but would rather do the exhaust only once. With all that said I am open to suggestions, sound clips greatly appreciated.

    Try here,

    https://www.bimmerforums.com/forum/s...arket-exhausts
    1993 850Ci.....18 years & 165,000 miles and counting!

  7. #32
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    712
    My Cars
    850,76 2002 &530,84 633
    Does anyone have a source for header flanges that would match the flanges on the twin down pipes that the cats are part of on the M70? I am thinking about a new exhaust system and would like to install new down pipes without cats. I guess I could cut off the old flanges and either reuse them or have someone replicate them if they aren't already available. Thanks,

  8. #33
    Join Date
    Sep 2013
    Location
    Commiefornia
    Posts
    545
    My Cars
    1996 850
    Quote Originally Posted by dragon850 View Post
    I have X pipe with mufflers and have 0 drone.
    when I sold you the SC it had Remus on it

  9. #34
    Join Date
    Jun 2008
    Location
    SF Bay Area
    Posts
    3,778
    My Cars
    Supercharged 850ci
    Quote Originally Posted by Braveheart61 View Post
    when I sold you the SC it had Remus on it
    Yes kept the remus, added x pipe in place of center resonator and installed mk motorsport headers.

    Sent from my SM-G925T using Tapatalk

  10. #35
    Join Date
    Sep 2013
    Location
    Commiefornia
    Posts
    545
    My Cars
    1996 850
    Wow good job Ed!

    whaere did you get the X pipe?
    did you dump the plugged cats ?
    Quote Originally Posted by dragon850 View Post
    Yes kept the remus, added x pipe in place of center resonator and installed mk motorsport headers.

    Sent from my SM-G925T using Tapatalk
    - - - Updated - - -

    I want to get rid of my M73 system and do X pipe and if possible lose the cats.

  11. #36
    Join Date
    Jun 2008
    Location
    SF Bay Area
    Posts
    3,778
    My Cars
    Supercharged 850ci
    Quote Originally Posted by Braveheart61 View Post
    Wow good job Ed!

    whaere did you get the X pipe?
    did you dump the plugged cats ?
    Standard 2.5" x pipe on amazon, yes the cats a re now replaced with a set of walkers. Sound is very good during cruising but gets snarly when you get on it!

  12. #37
    Join Date
    Sep 2013
    Location
    Commiefornia
    Posts
    545
    My Cars
    1996 850
    Would you have any part numbers?
    Thank You
    Quote Originally Posted by dragon850 View Post
    Standard 2.5" x pipe on amazon, yes the cats a re now replaced with a set of walkers. Sound is very good during cruising but gets snarly when you get on it!
    - - - Updated - - -

    Found these

    http://www.walkerexhaust.com/catalog...catalog-lookup

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