I am thinking of upgrading from my ta49 due to the turbo surge. I am looking at the gen 1 pt5862 or the pt5858 with a ported s cover. Is there much difference between these turbos ? I have 2 different 10" lu converters , 1 a 2,800 stall and the other is a 3,200 stall . Which turbo and converter would work best.