Do you ever come up with a list of parts that you will upgrade as they need replacements? Have you considered improvements if they were swapped with better aftermarket parts? When people talk about mods, I often get things like getting a new exhaust, coil-overs, and turbo/super charger, etc. These don't seemed like upgrades you would use for driving and in my opinion are unrealistic. Things I was considering:
1. New Tires
The easiest upgrade, and have big impact on performance. Actually, the stock tires on the last couple of cars have been pretty good.
2. Brakes
I haven't explore this, are aftermarket brake pads or rotor typically better than stock?
3. Lights
After a few years, the lens yellow, then it requires constant polish or I could just replace the whole light assembly.
Paul