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Dumb question but what is a panel? The air filter?Welcome.
Start here: https://shoforum.com/threads/sm105ks-sho-bible-builds-life.138235/
Tune, plugs, drop in K&N panel, best bang for your buck.
Use the search function here and do your own research, mind the date of the threads. Whatever you decide, just avoid Livernois.
Timing chains and all the updated pensioners, guides, cam gears, and sensors did a year ago before I took ownership from my son. I need to service the transfer case I'm sure. It was very well maintained beforehand though.Your car is now a decade old, so unless you have meticulous past maintenance records start with maintenance and changing ALL fluids first.