Turbo size will be more of a limiting factor than inj or nozzle size. As has been posted, the tuner can limit PW, limiting the total amount of fuel injected to tame a "big" injector for towing ops.
But a big lazy turbo that produces no boost in your given towing powerband, won't provide the air your engine needs....it'll run hot, and produce smoke. You'll end up having to run higher rpms to keep egts down.
Suggest a 64-68 mm inducer size turbo for opns in the 1600-2200 rpm range, and a 68-71mm inducer size turbo for 1800-2400 rpm range. Turbo turbine housing A/R size, engine tuning, HPO system health, the specific injectors you use, gearing, tire size, trans, and the weight your towing will all be factors too. Best to ride in a rig that's close to what you want to build before committing.
I think the Borg Warner S467.7 FMW PN 178855 is great turbo for our trucks with the 200% nozzle, and it's gonna be real hard to beat for it's price point.
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