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I also vote diffuser.
The M2/M2C has a really complete looking front end without any add-ons, but the stock rear diffuser is too basic for this car.
As to which one, I would say find a way to nudge it out of him what brands he likes so you get one you know he will like. It's definitely a personal thing, and also most of us consider the complete package when choosing cosmetic mods, so we want all the parts to match each other.
Tough call to just guess.
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