I have a 2.94 ratio in the car only because the motor is done at 4500rpm. I had a 3.23 but ran out of engine for the qtr. The Buick turbo is great. I have no issues with it and is a good match. Upgrading turbos really depends on your intended use.

I'm upgrading to a new motor and turbo over the winter. I will be using a PTE 6262DBB with a .63 AR. It should spool almost as fast as a stocker.

Shoot me a PM on any of the boards for any specific questions