Are you running one or know first hand about the mfg Greddy??
Are they any better than Garret or ??
The one I am looking for information on is the T-88 series, 4 bolt.
Greddy doesn't make turbos. They sell turbos and turbo kits. Mostly for sport compact cars.
If your interested in an 88 turbo I would suggest talking to a Turbo buick Place. Like Precision Turbo or an of the other sponsers here. They will be able to help you better than a place that doesn't deal with our cars.
But considering your post count I'm sure you already knew that.
The greddy T88 is not a true 88mm turbo. The 88 is only a 70mm wheel, so the same at a PT70. Also they use very large exhaust A/R's so spool up is somewhat slow, and they are still using the p-trim wheels on the turbine side.