Exhaust Assembly Paste for Joints?

Shouldn't be, proper materials would withstand the heat the same as the pipe does.

Where is the strain relief in this setup? I don't understand any of this, to not just slip fit some pipe together and weld it (or clamp, a standard generic sleeve clamp, if you must) before all this... Okay I see later in the topic that you're drifting that direction, but it took a while. ;)

OEM exhaust setups are great, until they aren't.
Yeah, I knew the OE clamp was getting worse. Even from the original photos to later ones. I never would have looked or known except for hearing a rattling at idle, then seeing the clamp crack.

Strain relief? Not really sure. There’s a firm attachment point just forward of this junction. Everything is hanging on rubber mounts behind that afaik.

I originally started this thread to learn if I needed the assembly paste in the joint. Simply because it was a touching joint without much holding it.

When I took it apart I saw the start of some porosity in the one end. The other mating side looked fine.

Thus I could replace half or both sides. I could coat it with paste or not.

My gut tells me to expand the one half of this new stainless part, then cut the oe exhaust, and slip one end that I expanded onto the OE pipe. This way I minimize compromising the oe pipe, can adjust length, and then just clamp it with some assembly line helping the seal.
 
Traditional u-shaped exhaust clamps come close to being leak proof but annoyingly can't often be completely perfect. There are some German (of course) stainless band clamps that are better. You're probably thinking with a couple inches of overlap, muffler cement will take care of any imperfections. Maybe? I haven't been that lucky.

The best seal is Tig/Mig welding in competent hands, and it would look cleaner in your example.

Nonsensical joints often have a reason, usually for ease of assembly in the factory. You see the same with brake lines, electrical harnesses, etc.
 
The fun continues.

Took apart the joint to fix the clamp.

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A drop of water and soot from just a short time going up on ramps.

Got it apart.

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Unfortunately the 2.75 ball set that I got doesn’t fit. I think my pipe is 2.5.

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So I cleaned it up a bit, added the paste, and put back the clamp.

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We’ll see how it ends up after a few hundred miles.
 
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