The Challenger has around 10,400 miles on it. I haven't done much to it. I've done one cosmetic mod to it. I put an old school Pentastar on the passenger fender like they did back in the 60s and 70s. I bought some smoked LED lights to replace those unsightly rear bumper reflectors. I haven't installed those yet due to the fact that you have to take the whole rear fascia off to get to the fasteners on the backside of the reflectors.
I have almost bought a Barton shifter more than once, but I don't hate the factory shifter like most people do. I guess when you are used to the ones they put in 1980s Chrysler turbo cars, anything is an upgrade. I may buy one of those 1970 style pistol grip shifter handles. They are made by Hurst like the originals, but they cost nearly $300. I have also contemplated buying a pair of wider factory style wheels and 305 or 315 width rear tires. I'm trying to decide if I think it's worth it. It doesn't offer that much more traction and it's hardly noticeable as a cosmetic modification.
As for drivetrain mods, I'm not sure if I'll ever do anything. My car is still under warranty and the ECU will tell them even if you were thinking about changing anything on a rainy Tuesday in March. I may eventually do the cam, big throttle body, long tubes, and a tune. It's expensive as heck to do that kinda stuff to anything newer than an old school small block V8. I'd like to find a wrecked 392 car and do all the mods to that engine and slap it in my 1980 D150. Wrecks are hard to find. You pretty much have to buy takeouts from shops that put the whole shooting match in a crate. They have videos of them running with ECU, wiring, fuel tank, engine/trans, gauge cluster, infotainment center, and key fob all on a pallet. My truck has an automatic transmission, so I'd like to find a 392 mated to the 8 speed automatic.