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Thread: Are SSI's louder than stock heater boxes?

  1. #1

    Are SSI's louder than stock heater boxes?

    I've seen people claim this but can't find anything more than a passing mention. I have SSI's and a Leistritz 2-in/1-out muffler on my 1970 targa (intake is stock snorkel/air cleaner housing). And it is still too loud for me, an early middle aged fogey, especially with the top off. I would switch to factory heater boxes if that would quiet things down further. Anyone know the story here?

  2. #2
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    Quote Originally Posted by Noah View Post
    I've seen people claim this but can't find anything more than a passing mention. I have SSI's and a Leistritz 2-in/1-out muffler on my 1970 targa (intake is stock snorkel/air cleaner housing). And it is still too loud for me, an early middle aged fogey, especially with the top off. I would switch to factory heater boxes if that would quiet things down further. Anyone know the story here?
    no................................................ .........

  3. #3
    I don't know about loud but many years ago - before online forums a topic of discussion was whether a stainless steel exhaust would sound the same as original steel exhaust. It was at the time when replacement exhausts from SS were becoming commonly available This was not related to Porsche cars but the general opinion was that they do sound different.
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  4. #4
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    Maybe a little louder , maybe . How is your muffler ? If you get a new muffler be sure to get one from Porsche and not a Dansk . The Porsche is definitely more quiet.

  5. #5
    Serial old car rescuer Arne's Avatar
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    I can't speak for SSIs or any other Porsche exhaust. But I did notice a difference in sound (not volume) on an MGB I owned when I switched from a mild steel system to a stainless system from the same manufacturer. The stainless had a "tinnier" sound. I don't know if that could have any similarity to SSI vs. steel heat exchangers.
    - Arne
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  6. #6
    A forty year old mild steel leistritz sounds just right to me. Not much left inside I’d bet. Don’t scrap it if you replace!
    Tom F.

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    If you compare a steel with a stainless steel muffler, then the stainless one sounds more amphoric but not louder.
    I don`t believe that the louder sound is from the SSI`s.
    The muffler makes the sound. Alternative to org. Porsche you can use the Port Folio of Eisenmann Exhaust Systems in Germany near Stuttgart.
    www.eisenmann-exhaust-systems.de
    They have several stock muffler of F-model and G-model including the RSR, ST, SC RS derivates and so on. The inside of the mufflers is like factory.
    During my time at Eisenmann I created a "stock-Looking" F-model muffler that`s good for more torque and some more horsepower. Sound is a bit deeper but street drivable.

    BR Jürgen

  8. #8
    Senior Member swisscheese's Avatar
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    hi Jürgen , was the muffler you worked on the " optimiert" version of their stock 91127.00600 muffler?
    T.
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  9. #9
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    Quote Originally Posted by Noah View Post
    I've seen people claim this but can't find anything more than a passing mention. I have SSI's and a Leistritz 2-in/1-out muffler on my 1970 targa (intake is stock snorkel/air cleaner housing). And it is still too loud for me, an early middle aged fogey, especially with the top off. I would switch to factory heater boxes if that would quiet things down further. Anyone know the story here?
    I'm pretty confident that only one of the respondents in this thread actually has SSI Heater boxes and can answer your question with actual personal experience. Care to guess who that may be?

  10. #10
    Quote Originally Posted by Jim Breazeale View Post
    I'm pretty confident that only one of the respondents in this thread actually has SSI Heater boxes and can answer your question with actual personal experience. Care to guess who that may be?
    I mean, I think you're talking about me? I'm looking for a comparison of stock vs SSI's, and I only have SSI's. So I'm not sure how I would be able to answer my question.

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