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      06-24-2019, 04:13 PM   #1
Rabidcat77
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Question Missing Bolt on top of Intake plenum

Hi all, I am missing one of the two hexagonal bolts/nuts on the top of the intake plenum. I've tried searching around to figure out the part number of these, but haven't had any luck.

I've been having the whistling noise that is detailed in this thread, and I'm thinking when I remove the plenum to fix that noise I'd like to replace the bolt at the same time.

From what I gather they look to be mostly for show, but nevertheless I'd like to fix what is a small simple part that bothers me by not being there each time I open the hood!

Thanks!
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      06-24-2019, 04:55 PM   #2
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im pretty sure its the same 10mm chrome nut that holds down the engine cover on E46 M3. hope it helps in your search!
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      06-24-2019, 05:36 PM   #3
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Chrome nuts on top of the manifold are for decoration only.
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      06-24-2019, 05:57 PM   #4
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This.

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Originally Posted by ciges View Post
Chrome nuts on top of the manifold are for decoration only.
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      06-24-2019, 09:29 PM   #5
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Quote:
Originally Posted by ciges View Post
Chrome nuts on top of the manifold are for decoration only.
Yep. Whoever tried to take it off didn't know that.

Pretty dumb they're even on there.
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      06-24-2019, 10:15 PM   #6
SAMM3Y
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Take the other one off.. save top end weight
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      06-24-2019, 11:44 PM   #7
Rabidcat77
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Quote:
Originally Posted by mapster37 View Post
im pretty sure its the same 10mm chrome nut that holds down the engine cover on E46 M3. hope it helps in your search!
Wow did a search for that part and it sure does look like that! I think that might be it! The screw underneath appears to be snapped off, but I figure I can probably figure that one out and fabricate something appropriate.

Thanks!
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      06-24-2019, 11:46 PM   #8
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Quote:
Originally Posted by lat77 View Post
Yep. Whoever tried to take it off didn't know that.

Pretty dumb they're even on there.
Yeah they could have done without them. Agreed...
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      06-24-2019, 11:48 PM   #9
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Seems like a good time to buy a Karbonius or eventuri plenum.
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      06-25-2019, 06:28 AM   #10
pbonsalb
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I recall reading somewhere in this forum that the nuts cover part of the mold used to form the plastic intake. There may have been supports underneath the nuts inside the manifold that were removed after it was made. Anyway, I recall reading something along those lines.
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      06-25-2019, 09:59 AM   #11
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With all the people upgrading to carbon plenums, the prices of oem plenums should go down. They go for $200-400 depending on condition.
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      06-25-2019, 12:21 PM   #12
pbonsalb
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Or they keep the stock ones so they can part the mods to sell when they get rid of the car.

I was thinking that with all the S65 blowing up, there should be a good supply of plenums should you need one for some reason, like you dropped your sledgehammer on it while working under the hood.
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      06-25-2019, 01:33 PM   #13
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makes for good garage decoration.
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      06-26-2019, 08:31 AM   #14
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Ended up purchasing one of these bolts, I may end up just epoxying it on. Thanks for the replies!
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      06-26-2019, 03:25 PM   #15
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Quote:
Originally Posted by Rabidcat77 View Post
Ended up purchasing one of these bolts, I may end up just epoxying it on. Thanks for the replies!
What kind of epoxy would you use for this? I need to do mine too. Thanks.
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      06-26-2019, 04:49 PM   #16
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Quote:
Originally Posted by bb_00 View Post
What kind of epoxy would you use for this? I need to do mine too. Thanks.
That's a great question, Ive had little success with epoxy, albeit the piece was probably subjected to somewhat higher temps, ignition coil pack cover.
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      06-28-2019, 08:37 AM   #17
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Quote:
Originally Posted by bb_00 View Post
Quote:
Originally Posted by Rabidcat77 View Post
Ended up purchasing one of these bolts, I may end up just epoxying it on. Thanks for the replies!
What kind of epoxy would you use for this? I need to do mine too. Thanks.
I had the same issue when i bought my car the bolt was already broken ... I used Gorilla 2-part "5 minute" epoxy to attach a new bolt/nut and have never had a problem
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      06-28-2019, 01:03 PM   #18
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It's likely that someone took them off during work on the top side and then over-torqued it when they put it back together. Ask me how I know.
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      06-28-2019, 04:00 PM   #19
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There’s absolutely no reason to touch deez
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