Cal, how does the 6466 (assume nonstroker engine) compare to DBB6765 ported H cover on a 109 stroker engine? I would assume HP and spoolup is similar?It's true. This is my favorite Buick turbo. It spools like a 62 and makes hp like a 67. You will need to spend some time porting the wastegate hole. It really wants to make boost. Both Hungerbuhler and a customer from AR removed 66mm turbos and picked up a bunch of hp. You can run 10's on pump gas with the right tune. The only downsides are the price (since they only come in BB) and they only come with an S-ported cover.