Originally Posted by grocerygetter
Gt9 is great for a positive displacement blower. I got it verbatim from LPE not to use that cam with a centrifugal. In a nutshell it has to do with the boost curve of pd vs centri. Much better cam choices out there for a centri.
I'm sure I could have spec'd as custom cam for my setup, but the GT9 is working great with my D1SC. I especially like the wide LSA for my automatic. Of course, my boost curve is different from other centris because of my wastegate.
For the OP, I added my GT9 before I added the blower, when I was full bolt-ons. I gained 50rwhp. FWIW.