New to Subaru Community 09 XT

How's it going fellow Subaru enthusiast. So as the subject title states I'm new to the World of Subaru. I'm a new owner of a 2009 Subaru OB XT. Its a 5spd manual and has 115k miles. The car is in great mechanical and cosmetic condition. With that being said I'd like to keep it that way. I want to do mods that would prolong the life of the turbo and engine. Not looking for a track car. Please forgive me if I sound nieve on here but like I said its my first subaru. Can you all share some recommended mods that would help with reliability and performance that wouldn't be an issue with emissions? I live in California.
Read about removing the Banjo bolt and tossing the filter. Things I've read about and possibly interested in is; oil/air separator, cat back exhaust, down pipe, up pipe, intercooler, waste gate, avcs oil line, digital boost solenoid, cold air intake. Which would you recommend doing or not doing and what manufactures for parts? Would like to avoid tuning if I could but if I had to who would you recommend? Want to do maybe a lift to add some beefier tires/rims and suspension...any recommendations?
Thank you