I am new to the list, and thought I would try to offer something worthwhile,
or at least semi-worthwhile. I recently purchased an 87 Syncro GL--90K. As
purchased the most pressing problem, was the exhaust.  About the only part
worth saving was the catalytic converter, so I decided to try one of the
systems now available from S&S header. I got mine thru California
Imports--$300USD. Includes everything but the converter.

It is now installed and so far I am satisfied.  It is slightly louder than
what I think stock was, and has a nice throaty sound.
I ask my mechanic about how difficult it was to install, and he did use the
"B" word, but also said it was not any more of a problem  than other header
type systems he had done. The fixturing for the welding in the manufacturing
process is critical, and it was not perfect on these pipes.

The only defect I have observed is that one of the pipes is just touching
the brush guard that runs under the engine. It is not much of a problem to
me, as I only need to get up my hill in the winter, and will not be doing
any off road excursions.  It looks to be easily fixable,  I plan to take the
guard off and weld a little material at the rear mounting points to drop it
down slightly for more clearance at the pipe.
See pictures at:    http://pages.prodigy.net/gfcochran
Gary Cochran
Duncan Falls, Ohio
87 Syncro
88 MB 190E
83 Scirocco
73 240Z
75 BMW R60/6