On good gas I could 22-23 with maybe 25 in the top of third. This is with a Joe L var. timing chip 23% 1st and 2nd, and 21% in 3rd and 4th.
Pump fuel 15-16 with 18% locked.
From what I understand I was running at the edge (if not beyond ) of the turbos efficiency.
BTW for stock or close to street apps. I would stay with the 33....the 49 pulls like a train from 3500 up but does spool a little slower and needs ( or rather would like ) a little more converter than I have.