Gasket question for sec 1, sec 2, to exhaust.

[DropTopKingM3]

Within the next 2 weeks I'm going to have my euro headers and euro section 1 installed. I see there's 2 gaskets needed where the header connects to the section 1, then 2 gaskets where the section 1 connects to section 2. Since I'm going to change all those gaskets it would make sense to change the section 2 to sec 3 exhaust gaskets.. I would like to prevent any exhaust leaks since everything is going to be removed.

My question is do all 6 gaskets have the same part number? 18307830674 .. and I would need 6 in total?

Thanks in advance.

[heinzboehmer]

No, they're all different. The headers to section 1 are the same for both pipes. Same for section 1 to section 2. Section 2 to 3 has a different gasket for each pipe. So four part numbers total. You can find all the lart numbers here:

https://www.realoem.com/bmw/enUS/partgrp?id=BL93-USA-04-2002-E46-BMW-M3&mg=18

[DropTopKingM3]

No, they're all different. The headers to section 1 are the same for both pipes. Same for section 1 to section 2. Section 2 to 3 has a different gasket for each pipe. So four part numbers total. You can find all the lart numbers here:

https://www.realoem.com/bmw/enUS/par...6-BMW-M3&mg=18

Thank you.

So I would need all 3 of these kits?

https://www.ecstuning.com/b-assembled-by-ecs-parts/exhaust-manifold-install-kit/e46m311_301kt/?gclid=EAIaIQobChMIiOWd__DM7AIVRNbACh2LwgLuEAQYAiABEgJuGfD_BwE

https://www.ecstuning.com/b-assembled-by-ecs-parts/exhaust-center-pipe-installation-kit-front/11627830668kt2/?gclid=EAIaIQobChMIiOWd__DM7AIVRNbACh2LwgLuEAQYAyABEgLQI_D_BwE

https://www.ecstuning.com/b-genuine-bmw-parts/muffler-installation-kit/18111719417kt/?gclid=EAIaIQobChMIiOWd__DM7AIVRNbACh2LwgLuEAQYASABEgKWWvD_BwE

[Slideways]

Thank you.

So I would need all 3 of these kits?

https://www.ecstuning.com/b-assembled-by-ecs-parts/exhaust-manifold-install-kit/e46m311_301kt/?gclid=EAIaIQobChMIiOWd__DM7AIVRNbACh2LwgLuEAQYAiABEgJuGfD_BwE

https://www.ecstuning.com/b-assembled-by-ecs-parts/exhaust-center-pipe-installation-kit-front/11627830668kt2/?gclid=EAIaIQobChMIiOWd__DM7AIVRNbACh2LwgLuEAQYAyABEgLQI_D_BwE

https://www.ecstuning.com/b-genuine-...SABEgKWWvD_BwE

Yes, but some of the hardware should be reusable like the cylinder head studs. Since it looks like you are in the Northeast, you might need to replace some of the hardware if rusted.

[DropTopKingM3]

Yes, but some of the hardware should be reusable like the cylinder head studs. Since it looks like you are in the Northeast, you might need to replace some of the hardware if rusted.

My car never sees rain or snow but I do plan on changing some of the hardware bc of age.

it looks like the ecs links I posted is missing 2 gaskets. I should be getting (4) 18307830674 gaskets. 2 gaskets where the header and sec 1 connects and another 2 gaskets for where the section 1 connects to the sec 2.
if I’m wrong please correct me.

[Slideways]

My car never sees rain or snow but I do plan on changing some of the hardware bc of age.

it looks like the ecs links I posted is missing 2 gaskets. I should be getting (4) 18307830674 gaskets. 2 gaskets where the header and sec 1 connects and another 2 gaskets for where the section 1 connects to the sec 2.
if I’m wrong please correct me.

x2 of 11627830668 is for headers to section 1

x2 of 18307830674 is for section 1 to section 2

[Slideways]

[DropTopKingM3]

Thank you gentlemen !! 👍

[Obioban]

You should replace all of the nuts, as they're one time use lock nuts, but no purpose in replacing the bolts if they're not rusted.

I'd only replace gaskets on sections you disassemble. As in, don't reuse any gaskets, but don't take additional things apart in order to replace more gaskets.