Cobra Street Rods & Quiet Core Baffles
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  1. #1
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    Cobra Street Rods & Quiet Core Baffles

    As one of the few exhausts that will fit my '14 M50, I'm looking to buy a set of Cobra Steer Rods (OEM#: 3718T)

    Several reviews describe these pipes as loud, even too loud. Other reviews speak of toning the pipes down a bit by adding Cobra Quiet Core baffles.
    Cobra customer service told me there are no QC baffles for the street rod pipes. I asked if maybe they had been discontinued, considering the reviews. This was their response.
    I believe there was a mis listing for quiet core baffles for the Street Rod exhaust. You can try it, but no guarantees… Cobra does not offer quiet baffles for the Street Rod Exhaust systems.
    My obvious question to the Boulevard hive mind:
    Has anyone direct experience with the street rod pipes and quiet core baffles?

    I'm very open to other suggestions, such as third-party baffle sets, baffle modifications or even a completely different product.

    Vera needs to clear her throat and find her voice. But I also need to remain friends with my neighbours.
    Last edited by unsupervised; 03-06-2019 at 12:25 AM.
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  3. #2
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    Quote Originally Posted by unsupervised View Post

    Vera needs to clear her throat and find her voice. But I also need to remain friends with my neighbours.
    Well then you do NOT want Street Rods.......or any other straight pipes for that matter......unless they offer a "real" baffle for them.

    Most of the baffles offered for straight pipes are a joke and do pretty much nothing......except take your money.
    Don't believe everything that you think.

  4. #3
    Ditch Magnet
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    i second that the baffles do next to nothing..there are two types of pipes stock and loud nothing in between. could'nt tell you why. the quiet baffles put a plate inside to make the sound go around but it changes the tone a little. i think if they added chambers you would loose the throaty rumble and it would sound muted.

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  6. #4
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    Quote Originally Posted by Easy Rider View Post
    Well then you do NOT want Street Rods.......or any other straight pipes for that matter......unless they offer a "real" baffle for them.
    The street rods are baffled. At least one would assume so considering on Cobra's technical FAQ they recommend against removing the baffles.
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  7. #5
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    Quote Originally Posted by unsupervised View Post
    The street rods are baffled. At least one would assume so considering on Cobra's technical FAQ they recommend against removing the baffles.
    Maybe.

    IF.....you can look in one end and see daylight at the other end.......then whatever is in there is not a real baffle.
    Don't believe everything that you think.

  8. #6
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    Other than hearing from someone who has tried it personally, here are the various answers from tech support.

    Cobra tech support tells me the stock baffle supplied with the Street Rod 3718T measures 1.75"x 10.75".
    J&P tech support recommends the
    Cobra Quiet Core Baffle 1-3/4" x 8-5/8" 9015Q to match up with the 3718T Street Rod.

    This gives the option of toning down the sound, if needed.


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  9. #7
    Ditch Magnet
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    those are quiet core. $20.00 a piece plus shipping. the ones for my cobra longs are 19". they have a plate in the middle creating two chambers.i think the change is about 4 decibels.

  10. #8
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    I've ordered the pipes. I'll install them as soon as weather permits. (It's still snowy here, but it's warming)
    I'll share a few photos and video.

    If I need to tone them down a bit with the "Quiet Core" baffle set, I'll post that info too.
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  11. #9
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    I have Street Rods on my 2008 and they sound great at start up and at idle but run it up through the gears and it's gets raspy, very raspy in my opinion. The same for cruising at highway speeds. I ride with a half helmet and wear ear plugs. Oh, and you're right, according to the Cobra rep I spoke to, there is no quiet baffles available for the pipe. He gave me the name of a company that would build custom baffles.
    Last edited by StanO; 03-13-2019 at 12:11 PM.

  12. #10
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    "raspy" is in line with most of the concerns I've read.

    Mine arrived today. As expected, the baffling is pretty minor. As a matter of fact, it's a resonator, rather than a baffle. I immediately thought of Easy Rider's post when I looked at them
    you can look in one end and see daylight at the other end...
    I'm approximately 100% sure I'll be exploring ways to attenuate these pipes.
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  13. #11
    Ditch Magnet
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    https://www.ebay.com/itm/STEEL-EXHAU...QAAOSwy5ZXCQjh i tried these the end is blunted over so you cant see thru them. and the design allows you to wrap some glass around. i would say they dropped about 10 decibels the best improvement i got.

  14. #12
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    Thanks for the tip!
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  15. #13
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    Final note on fitment for future reference:

    The Cobra Quiet Core Baffle 1-3/4" x 8-5/8" 9015Q are a 100% drop-in fit for the Street Rod 3718T pipes. They slid in easier than the stock resonators slipped out.


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  16. #14
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    AND......are they indeed quieter ??
    Don't believe everything that you think.

  17. #15
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    Quote Originally Posted by Easy Rider View Post
    AND......are they indeed quieter ??
    Sadly, I am unable to offer an empirical answer.
    Doing a resonator-baffle swap while everything is mounted on the bike, would be a hassle that exceeds my curiosity.
    Subjectively, the quiet core baffles have left me with a setup that is more ridable than many reviews of the stock Cobra pipes would suggest. All that is, of course, anecdotal.

    It's loud, but not grating. All in all, I'm happy with the results.
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