I don’t do mods generally. Having said that, I do use two that I find indispensable. First is the Bijan tree mod. So much better than stock and no performance hit.
Second is the Mugz TBM mod. Now that MS has “fixed” the ITT by breaking it, it’ll take them another year to undo that. The Mugz mod flies and behaves like it’s supposed to. Plus the cool opening/closing doors.
There’s no downside to either mod that I’ve seen or heard about