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Thread: Exhaust Recommendations

  1. #1
    Member mwesten's Avatar
    Join Date:  Feb 2020

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    Exhaust Recommendations

    Planning on removing stock exhaust within the month in favor of a new setup (PM me if youre interested in any old stuff Im removing). Heres the basic plot for the new setup:

    - Stainless headers, stainless studs, brass nuts
    - No cats (car is antique status, no emissions)
    - Each header routing direct to separate mufflers
    - Prefer bolt on for easy removal if necessary (future work, etc) but open to welding
    - All of this is similar to Brice Palustran?s setup (see pic)

    Id like to have the quietest, shortest muffler possible, oval or round. Prefer stainless but not opposed to aluminized if necessary (I don?t drive in the rain, plus it?s always garaged). Deeper tone preferred. Open to resonator tips and/or silencers.

    Any experience with a setup like this or specific products that you found that fit the bill I?d be much obliged!

    IMG_4250.jpg

    IMG_4185.jpg

  2. #2
    Senior Member 82DMC12's Avatar
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    Careful, if you run without cats your car will stink both hot and cold. High flow cats like DPI has will nearly eliminate exhaust odor and still run freely which I expect is what you're after. Not sure about you but clothing stinking like exhaust gets old not just for you but other people around you too.

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    Andy Lien

    VIN 11596 Jan 1982 build - owned since Nov. 2000!
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    Now Kansas City

  3. #3
    President, DeLorean Industries
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    The last exhaust system you will ever need:

    https://deloreanindustries.com/delorean-spec-i-exhaust/
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  4. #4
    DMC Timeless's Avatar
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    Forget the aluminized. It will rust even if it's garaged when not in use. I know too well about this after 25 years in the business. DPI and done.
    ~LXA~
    Dunmurry | Stuttgart | Leipzig | Munich | Tochigi | Fremont | Bratislava | Sindelfingen | Kansas City | Oakville | Coventry

  5. #5
    Senior Member
    Join Date:  Feb 2013

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    Quote Originally Posted by 82DMC12 View Post
    Careful, if you run without cats your car will stink both hot and cold. High flow cats like DPI has will nearly eliminate exhaust odor and still run freely which I expect is what you're after. Not sure about you but clothing stinking like exhaust gets old not just for you but other people around you too.

    Sent from my Pixel 6a using Tapatalk
    Did the euro spec cars stink? I really wanna go cat-less but the odor is my main concern.

  6. #6
    Senior Member
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    Quote Originally Posted by L3V3L1 View Post
    Did the euro spec cars stink? I really wanna go cat-less but the odor is my main concern.
    Now everyones sense of smell is different. Diesel makes me sick.
    I'm not running cats on my D and I don't think it's that bad.
    You'll smell it mostly until it warms up or in a enclosed space. Now if you don't know the smell you haven't spent a lot of time around classic cars because it doesn't smell that different. Plus I driven by many groups of cops and they never said a thing about the smell or sound.
    I also don't live where they check emissions.


    Dave B.

  7. #7
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by WHO1DMC View Post
    Now everyones sense of smell is different. Diesel makes me sick.
    I'm not running cats on my D and I don't think it's that bad.
    You'll smell it mostly until it warms up or in a enclosed space. Now if you don't know the smell you haven't spent a lot of time around classic cars because it doesn't smell that different. Plus I driven by many groups of cops and they never said a thing about the smell or sound.
    I also don't live where they check emissions.


    Dave B.
    I agree. My CAT is hollow and I don't think it smells.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  8. #8
    Senior Member r00b's Avatar
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    You can get test pipes from dpi so you don't need cats https://deloreanindustries.com/delorean-test-pipe-kit/

    It won't smell bad, the smell reminds me of my Mode T.

  9. #9
    Senior Member AugustneverEnds's Avatar
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    I'm a member of the hollow CAT club; the smell is most noticeable upon cold start, lasts longer when it is cooler outside (for obvious reasons) and is amplified by running in an enclosed space. Once the engine is up to operating temperature, I find it to be negligibly different compared to a car with a functional CAT. Where I live vintage vehicles are exempt from emissions testing. My .02 worth, your results may vary.
    Nick A.

    1988 BMW 325is
    1982 DeLorean DMC-12
    1989 Jaguar XJ6

  10. #10
    Senior Member
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    If your car smells bad it could be an oil leak dripping onto the exhaust or maybe you are in open loop and/or running too rich. For it's time, the K-Jet fuel system in the Delorean had very low emissions numbers especially when compared to other cars of the era. As for noise, even hollowed out cats are good enough to keep the car from getting too noisy. The early turbo cars didn't have cats, only small mufflers, and they were not very noisy.
    David Teitelbaum

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