Not mine, Just Sharing....
http://boston.craigslist.org/gbs/pts/1530265267.htmlRabbit/Jetta turbo diesel headpipe NOS - $50 (Western Mass.)
Date: 2009-12-30, 9:45AM EST
I have a new downpipe/headpipe that fits early 1980s VW Rabbit/Jetta. This pipe installs to exhaust manifold curves down under car and mates with center exhaust section. Rust free-never used. This part fits ONLY turbo diesel models. $50 plus shipping. Call AT&T cell at 413 563 1829.
I'm pretty sure you can buy a brand new Bosal mk1 TD downpipe for 40 bucks online...
Turbo is NOT the same as NA. There is a huge difference on the mk1s.
Mk2s you can get away with it but it has a good chance of leaking since they (NA vs TD) are at opposite angles.
You might be able to use a mk2 TD lower downpipe instead of the mk1 one but I think you might run into shifter problems. The MK1 TD piece is very specific to the engine/chassis.
That is the turbo pipe bro go to bosal.com and check it out
Wouldn't it be cheaper to weld up your own?
Wouldn't it be cheaper to weld up your own? 
If you have the fabrication skills sure... a friend of mine just bought some mandrel bent stainless pipe sections from Jegs and made himself an outstanding exhaust for his TD Westy.