You're welcome. I've been the benefactor of the knowledge pool here, as well.
Yes it will blue if you are not careful. In the set I bought, by sheer luck (I didn't plan it that way) there is a weld ring inside the 'tails where the factory welded the fishtail tip to the straight pipe. You can see it in the rear baffle pic. If you weld it to that ring, go slow and only hit it for a spot then let it cool some, it does not blue the chrome. The one in the extension is covered up so it doesn't matter if it blues.