These numbers are just off the top of my head from memory but if I remember correctly the max CFM of a 2554 is 398 cfm @ a PR of 2.0. The 16T does 432 CFM at 2.0. You really want to jump up to a 19T which is rated at 500CFM at 2.0. A Garrett 2860 does 530 and a 2871 will do 598. So in answer to your question no the 16T won't be much better than a 2554 which from my experience is too small for the 4 banger.
The 2554 runs out of breath pretty much at 10-12 lbs. If you read the compressor map and do the calculations it'll make more psi but it won't move any more CFM which is what it is all about. Running the 2554 above 12 just makes lots of heat and cracks pretty much everything on the turbine side. The 2554 makes a great low boost turbo though with no headshim.
M5