Tony, your points are spot on, im just thinking about the guys here who have ran them and struggled. Theo Wollett used to run one and it didn't perform well, they have trouble coping with high shaft speed needed to make the power. Theo went through quite a few items before giving up and using a Garrett based turbo. RH9 also tried one and ran into the same issues with performance. It now runs a Garrett based turbo and makes spastic power without issues. Glen may have been a like the Japs and known how to achieve good results with them reliably. Us aussie's havent had a lot of luck with them.
cheers