You would already know this (hint, hint) if you had looked at the FAQ Locator. Alexander Shikhmuradov, Lowell Foo, and John Christou (among others) have done this, and helpfully provided instructions to Eric Porter, who made this Mini How-To page of how to do the wiring. The full VFAQ is here, courtesy of Dallace Marable.
The reasons for doing this are threefold:
- the 2G MAS, being shared with the Stealth, flows much better than the 1G MAS.
- the 2G MAS does not have difficulties with very high flow rates, where the 1G MAS will eventually start 'missing' counts.
- The 2G MAS, apparantly, has lots of 'whoosh'.
Doing this swap generally requires some type of fuel management computer, as the 2G MAS is not a drop-in replacement for the 1G MAS. However, Keith McDonnell reported that the 2G MAS will operate almost perfectly with the stock 1G computer when larger 550 cc injectors are also fitted. The bigger injectors add more fuel to offset the additional 'uncounted' air flowing through the larger MAS. Keith was experimenting on a Galant VR-4, , which could possibly behave slightly differently than other DSMs, but his results were confirmed second-hand by Dallace Marable. For more details, read his Keith's post here.