Best Upgrades for a 2015 BMW 335i (N55 Engine): Mods to Consider

Hey guys, I'm looking to upgrade my 2015 BMW 335i with N55 engine and was wondering what mods people consider best for this platform. I've seen some posts about intake upgrades, but also heard that exhaust system can make a big difference in terms of performance and sound. Has anyone tried any of these or other upgrades that might be worth considering?