Hello and welcome.
Easy things first?
The downpipe and exhaust system behind it are a good place to start. When choosing an exhaust system you may want to choose one that has minimal drone.
An upgraded intake system forward of the throttle body should help. Picking up cooler dry air is beneficial.
Your probably know this but just in case...watching for detonation and reducing the tendency to detonate is important on turbo engines.
Hopefully this will get you started doing some research on the site. Learn as much as you can on a topic then come back with questions that might fill in those missing bits.
Paul Lohr