I want to upgrade my turbo, I looked into the CAS Project X and like it, but I don't know if I'll have any problems. I was also thinking of just getting a 70 series BB. Tony at CAS told me that my 50lb inj. and a 3500 stall would be ok for the twin turbo. What size inj. and stall would I need for a big BB? What are the advantages and disadvantages of both?