Mazda, of course, make the FE3 engine and it is a 2.0L I4, DOHC, 16 valve, with 170hp. There is an even rarer form of it that came on the 323GTX rally car and it has the turbo pumping out 260hp. A guy in Florida sells the non turbo form of the engine for $1500.00 and his name is Jay B. (or boostedmx6 on Probetalk.com). He is also developing a turbo version for the US/ North America. Unfortunately I do not know how to reach him.
Parts for the 1Gen GL... Yeah, they're out there but they are definitely hard to find. Nopi and pttunning have been mention already, I think. Some other places to look are www.probesport.com
(but you need to look in the MX6 section for corksport).
Another place for ideas is www.performanceprobe.com
Bolt-on turbo...hmmm... no dice there. I have looked everywhere for a similar application but nothing doing. It would be cheaper and easier to transplant the GT engine, tranny, and ECU into your GL.
See my signature for my website, if you would like to compare notes with. or drop me a line sometime at firstname.lastname@example.org
and let me know how your project car is coming along.
Other than that, Welcome to the fold.
1990 PGL with some extras! :bs4:
See it at: http://photos.yahoo.com/anomly1 (in the 1990probe folder)
165,000 miles on the original clutch and still going strong