[Region Warrior]

Kinda car related...

Had(still have stored away somewhere???lol) HO slot cars with a 4 lane slalom track and a 25' drag strip.

Upgrades with performance armature/magnet/brush sets.
Graphited the axles and gears ect.
Largest tallest silicone slicks could get. Better for top half of track on real fast cars.
Shortened all "slot pins" so wouldn't drag in groove.
Experimented mixing/matching parts from different kits resulted in even faster cars.

Be 3-4 of us at a time betting on each others cars on 1/4 mile races same as our older brothers did with their street/strip cars lol.
My fastest car only had to come out the case 1 time ever when my 2nd and 3rd fastest cars needed cleanup real bad after dozens of run each. It would beat my 2nd fastest by 2'.
No one had ever seen it except my older brother was home one night and I showed him testing with lights out. It would throw sparks nearly 2" wide
No one would ever let me use that one again...

Anyhow, long story short, most unusual mod was one I day decided to use extra burned up chassis and parts to make an all wheel drive car.
Took some experimenting, trial and error, but turned out good. Don't go any faster though...