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Thread: Leistritz Police: Please Confirm Year-Model Application!

  1. #1

    Leistritz Police: Please Confirm Year-Model Application!

    Leistritz Police,

    Please confirm if stamped info on photo of stainless steel Leistritz 2-in 1-out muffler is correct for a 74 thru 76 US/Euro Carrera RS.
    My Thanks in advance.

    Paul Rodelo
    Attached Images Attached Images

  2. #2
    Senior Member
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    For reference my Carrera RS has Bischoff x/72 date so it is possibly original to car as came together with it 25 years ago and the date corresponds to car build date -- but who knows for sure.

    The model year 1973 Carrera RS was rest of world spec (not just euro markets) and 2.7 Carrera RS model was produced only during 1973 model year 1972-73 so date mark of example 11/75 pictured doesn't correspond to in production 1973 Carrera RS. There was a later year RS of course.

    If this sounds picky one key point is about the different shape of the muffler outlet wrt the body panels at rear.

    Maybe although you say RS from the other comment you probably mean the 2.7 Carrera 74 onwards with similar engine but impact bumper rather than the different shape 73 Carrera RS?

    Iirc the outlet shape and curve of 911 muffler changed post 73 model to accommodate the impact bumper profile. What is outlet shape of your muffler -- maybe it fits that later impact bumper incarnation as the 2.7 MFI continued in ROW ( as well as in name but different lesser spec for NA market).

    A picture with shape of outlet of your example might help be sure of this point as later shape mufflers to my eye don't look correct on early pre impact bumper cars. Possibly the other part numbers stamped on muffler beyond date indicates exact spec directly but I don't have complete 70s leistritz part lookup. I do have partial information.What I do know is:
    - 91111102500 is the original correct Porsche part for the 72/3 TES and Carrera RS
    - also know from a nos leistritz label on an actual nos exhaust muffler that part 591 0783 one time corresponded to 91111102500 for TES 130-190 PS.
    - While label on muffler doesn't mention RS presumably it is same part for more powerful 2.7 as Porsche doesn't distinguish muffler part number for all 911 models in old 1972/3 paper parts catalogue.
    Haven't checked PET version as supercession online often doesn't bring in-period clarity.

    On this basis I suppose impact 73 RS could at one time have lestritz part no prefix of 591 wheras yours has prefix 421 albeit with same suffix 0783 -- so maybe prefix change could be significant e.g. different/later variant muffler possibly by that date for impact bumper? Maybe prefix is not significant and shape would fit pre impact Carrera RS and TES.

    I'm sure someone will want a West German mid 70 old item which seems to date from around time of Porsche model year 76 based on 11/75 date stamp.

    My spare leistritz (with later date stamp than my car assumed Bischoff original) that is in storage would certainly need outlet pipe modification of I ever needed to use it on the 73 Carrera RS. The "obvious from a great distance" poor fit to earlier shape rear body panels far outweighs any "close look nuance" of being stamped West Germany with the older stylised leistritz script (albeit incorrect later date stamp). That's why I'd need to change outlet if I ever needed use it as is on my 73 RS. Shape of outlet is another one of those details that can get missed in renovation or muffler replacement but jars the eye vs the way the original spec muffler with correct square edge capping sits and fits one year only pre impact 2.7 and other TES models from that era.

    Possibly others on this forum who regularly work with these old cars professionally might know more about the leistritz part numbers and the muffler evolution as I'm just a classic car hobbyist. Always happy to learn from the experts here.

    HtH


    Steve
    Last edited by 911MRP; 01-04-2019 at 03:44 AM. Reason: Typo

  3. #3

    Leistritz Police: Please Confirm Year-Model Application!

    Steve,

    I really appreciate all the detailed information.
    Below are more pics of the SS Leistritz 2-in 1-out.
    The only modification made by previous owner was install of an O2 bung.
    O2 bung is not visible when mounted on car.
    Note: I did previously install this Leistritz on my 70 911.
    It fit in the stock location without issue.

    Thanks again,
    Paul Rodelo
    Attached Images Attached Images

  4. #4
    Senior Member
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    It is not a "US" Muffler as all the mufflers for 75, 76 and 77 911s had a fitting on the front side for a EGR pipe. I cant say for sure what ROW mufflers on 76 911s look like as I am born and raised in California. Even back in the mid 70s we were ahead of the rest of the US and the world with smog regulations and had our own exhaust systems starting with the 75 year model 911s.

    Ciao

    Jim

  5. #5
    Member #226 R Gruppe Life Member #147
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    cars not for California didn't have EGR in 75-76. I think USA by 77 had EGR. The only way I know to absolutely know if a muffler is SS, is if it has 4 layers of metal at the muffler seams. A real close picture of the seam is what I need. SS mufflers were mild steel double wrapped in SS and are still magnetic because inner skin is magnetic. Check it out. G

  6. #6

    Leistritz Police: Please Confirm Year-Model Application!

    Gled49,

    Based on the pics below, it is exactly as you described, the stainless steel muffler has (4) layers.

    Thanks,

    Paul Rodelo
    Attached Images Attached Images

  7. #7

    Leistritz Police: Please Confirm Year-Model Application!

    Gled49,

    Also referenced below is my 1969 date coded mild steel Leistritz with (2) layer construction.

    Thanks,

    Paul Rodelo
    Attached Images Attached Images

  8. #8

    Leistritz Police: Please Confirm Year-Model Application!

    Jim,

    After reading your post and reviewing Steve's (911MRP) post, this SS unit appears to be a pre-impact bumper Leistritz as it has the same tailpipe design and angle of my 69 date coded Leistritz and fits on my 70 911 without issue. Again, I really appreciate everyone's input.

    Kind Regards,

    Paul Rodelo

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