Need source for slip joint exhaust parts Options

[yarin]

I'm also looking for parts to repair the slip joints of my 4-2-1 header system I described in the other thread.

Based on the pics, it's obvious that at some point in time I had an exhaust leak (it's also obvious that I Was running rich....). I posted previously about an off throttle low rpm decel situation that leads to a huge BANG of a backfire. Could a leak this far down the system cause such a condition? I checked the stub pipes, and gaskets, everything seems tight.

What I really would like to do with help from my welding buddy is weld shut the existing collector pictured here, and cut/weld in a new slip joint pipe.

(IMG:http://farm3.static.flickr.com/2177/2058117731_d9b5d8ceff.jpg)

Leaks like this also lead me to believe my wideband O2 readings are skewed but to an exhaust leak upstream of the sensor. I want to patch all of that up and see what my AFR numbers look like.

Do I even want a slip joint coupler? Should I go with a flange type junction? Or just weld the damn thing shut?

Anyone know where I can get parts? Maybe a motorcycle header system, I believe some use slip joints.

Thanks