I am no expert but remember reading and in summary:
TA49 flows about 150 CFM (13 Lbs/min) more than the TA33 and is A LOT MORE efficient. You will need the TB relocating plate (From Turbo6X2) and reclock. You will also need to modify the compressor outlet (if not already done) to fit the HA intake. You will also need a higher stall coverter (Around 2800).
Overall, great turbo, not "stock appearing" and a GREAT price.
TTT for you.