[jmracecar]

The Boxster and 996 transmissions are often cheaper than the G50's... especially the early lighter-duty 5-speed Boxster unit. However, Porsche does not sell most of the parts for the Boxster & 996 transmissions. If you can run one "as is", and maybe replace a broken one for $2k some years later with another used one, then hey why not. A new factory rebuilt unit is something like $4000 with 2 yr warranty. This is why almost no one else is rebuilding these. The main bearing seems to be a problem, otherwise fairly trouble free if not overloaded. 996 Carrera makes around 300-320 hp depending.

The bellhousing is larger in diameter and has different bolt spacing from the G50's and G64's -- not at all interchangeable.

Note that the 996 turbo & 996 GT2/GT3 trans is totally different from the above. Those are evolutions of the G50/52 and G64/51. These are still G50-compatible for mounting at the bellhousing end.