Would tune fall into the mod category?
From all mods I have ever done to cars tune on FI engine seemed to be the best return for money (meaning fun and always smiling).
Not sure if I could count this, but heck - it was a mod after all. WINTER tires. Damn, the OEMs suck on packed snow...
I could expand the list for mods that I did and I liked them for a moment, but on the long run were bothering me too much.
- BOV atmosphere vent (the pshhh was annoying on several occasions)
- SRI or CAI - too noisy for my personal liking and too much vacuum like sound
- dog bone mount (nice, stiffer, better response, but too much vibrations for everyday use in a family car)
- OCC (winter proved to be killing the system and resulted in leaks - too much water)
Mod I did not get to - ATF cooler.
so in short.
TUNE (that was "stock tune" - HKS spark plugs, KN filter drop in , 93 octane).
ATF aux cooler (if I had the time to do it).