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I've got a slip-on Turbine Core 2 silencer and an accompanying piece of pipe to connect it to the expansion chamber. The pipe has a crack in it. I'd like to have this welded so I can use the TC2 when I go to the woods a couple times a year. What kind of metal is the pipe stinger? A magnetic doesn't stick, so must be stainless?

In this photo, the pipe to the right of the actual silencer:

yes, stainless

Alimunium won't throw sparks if you grind it. Stainless steel should.

Excellent. Thanks. I'll find a SS guy in town and get him to weld that crack up.

Good luck with it.

I may also just skip it. I have one Turbine Core 2 good to go on the 220 and I only need a second one for the 200 for the 2x a year trip to the mountains. The rest of the time, the Powercore 2 is fine on the 200 . I could toss the stock S/A on for those trips.

We decided to just skip it. The pipe's cracked about 3/4 of the way around and my local welder wasn't too optimistic about it. No big deal. I'll just snage another one AFTER and IF I get the bike titled/licensed/stickered which is essential to ride on public land here in New Mexico. And a royal PITA since neither neighboring CO nor TX require titling.

Oh wow. 3/4 way around is a BAD crack.

Save it in case you need parts off it!

If the tube is clean inside & out, it can be TIG welded with no problem. When I say clean, I mean really clean. Purge the inside of the tube with argon to protect the weld pool.
300 series is not magnetic or Austentic.
400 series is magnetic or Martinsitic.
You can put a magnet on it to figure it out.
No matter what, 304L filler rod or higher will work. The "L" stands for low carbon. The Chromium in stainless steel has a very strong attraction to carbon. It forms chromium carbide which will rust around the weld area. To prevent rusting, trace amounts of Titanium are included in the filler rod chemistry or metallurgy. Titanium has an even stronger attraction to carbon, than chromium does, forming titanium carbide. Titanium carbide does not rust.

If you lived close & cleaned the part good enough, I'd probally weld that for cheap. The hard work is in the cleaning. The welding is easy.