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Yeah the 1.1 has the 83mm turbine wheel in it. Not good beyond 850-900hp as they get backed up though. Just depends on the power you are looking for. If you want to make 800+ with a 5.3l I would run the 1.32 with a 96mm turbine wheel.
How about the T6 1.10 a/r version? Shouldn't that have decent characteristics with 5.3?
Yes the T6 version can be done with the smaller turbine wheel. Also their is a 87mm turbine wheel as well, its more money, but fills in the gap between the 83mm and 96mm.