weird Cobb catted downpipe sound?
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This is a discussion on weird Cobb catted downpipe sound? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; so I installed a Cobb downpipe on my '12 wrx a few weeks ago, and after installation, I started it ...

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    weird Cobb catted downpipe sound?

    so I installed a Cobb downpipe on my '12 wrx a few weeks ago, and after installation, I started it up, and it sounded a bit strange at idle....Sounds like a diesel, fast tapping noise. It only makes this sound at idle though, usually louder on a cold start. I've gotten mixed responses on what the sound is, but I just wanna see if anyone has the same sound. It's a cobb catted downpipe mated to a stock cat back. anyone have any input?

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    ClubWRX.net Vendor Fast Tuning Products's Avatar
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    \_(ツ)_/ Rambo's Avatar
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    Did you re-tune for the downpipe?
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    Quote Originally Posted by Fast Tuning Products View Post
    You could possibly have an exhaust leak.
    Possibly, Im removing the intercooler and heatshield this weekend to recheck the bolts to the turbo and the ones to the midpipe.

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    Quote Originally Posted by Rambo View Post
    Did you re-tune for the downpipe?
    yup, I have retuned for that. I'm currently on my second revision of Torqued Performance stage 2 map.

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    \_(ツ)_/ Rambo's Avatar
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    Did you check all the heatshield bolts? A loose heatshield makes a HORRIBLE racket, and the noise can vary with rpm. Ask me how I know...

    After installing my downpipe, I used an aftermarket heatshield with only three points of torture, as opposed to 12 kabillion bolts on the factory shielding.
    Isaac -- 2003 WRX sedan Stg II - Gave its life for mine 6/2013.
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    I had a similar issue, and it turned out to be that I did not tighten the 02 bung-bolt sufficiently, and it was making strange noises (like a tapping at idle). Just something to check as well.

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    Quote Originally Posted by Rambo View Post
    Did you check all the heatshield bolts? A loose heatshield makes a HORRIBLE racket, and the noise can vary with rpm. Ask me how I know...

    After installing my downpipe, I used an aftermarket heatshield with only three points of torture, as opposed to 12 kabillion bolts on the factory shielding.

    YOU KNOW.....THAT MIGHT JUST BE IT i have the cobb heatshield with only 3 points....i'm gonna take a look at it...

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    Quote Originally Posted by TankerTruck View Post
    I had a similar issue, and it turned out to be that I did not tighten the 02 bung-bolt sufficiently, and it was making strange noises (like a tapping at idle). Just something to check as well.
    checked that a few days ago, that's secured pretty good...still not sure about what the sound is...

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    Gold Member lokey's Avatar
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    Can you isolate the noise when listening from the engine bay (not the driver's seat)? In other words, have you tried pushing down on the heat shield, tightening the 02 bung, etc with the car running to see if it stops?
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    Hey sorry to revive and old thread with my first post, but I'm having the exact same issue on my 12' wrx. It has me kinda worried and I'm wondering if the op's problem was ever resolved?

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