I think that 5-7 years down the road, when the Tesla battery gets old and decrepit, a nice retrofit of a very nice internal combustion engine would be fun. Then again, it would not be a cheap change - fuel tank, drive train, engine - lots of parts to change.
Better off just buying a Mustang in the first place.
The Tesla battery was designed to last 300 to 500,000 miles that's like 20+ years.
...retrofit of a very nice internal combustion engine would be fun.
Maybe, but the Tesla Model 3 is not a particularly pretty car, the best part being the brutal torque and having eliminated the traditional drive-train. (atomic transmission and driveshafts)
If I was going to hot-rod a Tesla, I'd probably lose the body and batteries, keep the platform and use a small 200-300 HP turbo engine.
With some minimal batteries (just to get it rolling smoothly from a dead stop) and the AWD motors being driven directly by the turbo engine, it should still be lightweight and able to smoke the aforementioned Mustang.