Replacement Hardware for Downpipe/Midpipe Flange

arfboy · 04-27-2023, 03:11 PM

I started the process to install an AA EL midpipe. One of the nuts/studs was completely rusted/frozen together and I stripped the nut. I started to cut away the nut, but left it unfinished because I ran out of time. I will take it to a shop to have the nut/stud removed. I read that my situation is not uncommon. Any recommendations on what hardware I should use as replacements? Links would be appreciated.

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Sephrr · 04-27-2023, 07:30 PM

When I installed my midpipe I got new donut gasket and the new bolts from the dealer. Was like $15 or less for everything

b_w. · 04-28-2023, 08:15 AM

I had the same issue and had to drill mine out. Used grade 8 5/16 bolts and nuts.

TopJimmy · 04-28-2023, 11:08 AM

If the stud isn’t wrecked I’d ask your shop to clean the stud threads with a tap&die set. Then get a new set of copper nuts so you can reassemble like original.

04-27-2023, 03:11 PM	#1
arfboy Private 26 Rep 80 Posts Drives: F80 M3 Join Date: Jan 2023 Location: CA iTrader: (3)	Replacement Hardware for Downpipe/Midpipe Flange I started the process to install an AA EL midpipe. One of the nuts/studs was completely rusted/frozen together and I stripped the nut. I started to cut away the nut, but left it unfinished because I ran out of time. I will take it to a shop to have the nut/stud removed. I read that my situation is not uncommon. Any recommendations on what hardware I should use as replacements? Links would be appreciated. View post on imgur.com
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04-27-2023, 07:30 PM	#2
Sephrr Second Lieutenant 289 Rep 272 Posts Drives: 2016 M3 Join Date: Feb 2022 Location: Indianapolis iTrader: (1)	When I installed my midpipe I got new donut gasket and the new bolts from the dealer. Was like $15 or less for everything
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04-28-2023, 08:15 AM	#3
b_w. Lieutenant 439 Rep 571 Posts Drives: F80 M3 Join Date: Jul 2022 Location: Alberta iTrader: (0)	I had the same issue and had to drill mine out. Used grade 8 5/16 bolts and nuts.
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04-28-2023, 11:08 AM	#4
TopJimmy Major General 5535 Rep 5,204 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	If the stud isn’t wrecked I’d ask your shop to clean the stud threads with a tap&die set. Then get a new set of copper nuts so you can reassemble like original. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
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