I got the cracked bellhousing back. I tried the vinegar test on it. I can confirm that it reacted, so it was definitely magnesium.I think it's very likely both magnesium and aluminum versions have been used. Probably in later years a switch to aluminum was made, for cost reasons.
You had to ask. It took me 20 minutes to get the press-fit starter bolt out just to do an apples-to-apples weight comparison (both of these had the motor mount in, and the magnesium one has a little bit of grinding where it was cracked).BTW: is the weight difference noticeable?
Hmm, seems like some evil marketing strategy.Only the early GTV6 came with the Mag alloy parts in my observation. I seem to recall an early GTV6 brochure that touted quite a lot of Mag parts.