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Diesels don't operate like gassers really at all. All diesels operate at WOT and run lean. In light of that you get alot more power from every drop of fuel the more air you can get in the chamber as well.
Cold and lots of it is whats good for diesels. If you grill block to boost engine temps you shoot yourself in the foot by sacrificing much higher AFRs for a little engine temp. The pre-cooler's ability to reduce AITs is also very important. The colder the air the more you can squeeze in.
Moon disks and wheel skirts, larger tires, lighter wheels and any other potential weight reductions. If she really gets serious about it she could drop the AC completely and it has a good chance of also increasing engine efficiency because its not trapping heat in and around the air intake.
Not sure on the benefits of totally removing AC opposed to just not using it. Tuners with chargers and pre-coolers do it to get better airflow over their intake lines. . . They also do it to cool the engine better(no large shield).
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