WOW when I saw the mileage I was gonna suggest the down pipe. Mine failed at about 90K. The downpipe on my 2015 was really weak and cheap IMO. I have replace the stock for a CVF no cat downpipe. The quality on their stuff is great.
Wasn't much for me. I have FBO PD tune. Without a dyno I should be around 380-400lbs. I have a spec stage 2+ I haven't installed yet as I want to add a drive shaft do around the same time.
I have them with Koni yellow adjustable compression stiffness. They work great as daily for me for years(since 2015). I recommend pairing springs with new shocks. It tremendously improves the handling and breaking.
I have the same year Base PP car in guard, love the color, get compliments all the time for it. Feel like we may share some similar direction.
I started with suspension. Koni(Yellow compression adjustable), Eibach proKit with 1/8(Steeda) spacer in the rear to raise a 1/4 inch for the look...
If this car(2015) has a stock intercooler start there immediately. Also I have a 2015 PP Manual and recently walnut blasted the valves which afterwards felt like 30-40HP gain.