Once you own a machine it is an American/UK traditional “right” to modify it.

Other countries differ.

In the airplane area swapping engines has had HUGE world changing consequences.

In the late 1999s I had a strong urge to buy a very modest priced used Jaguar V10 HE sedan nearby with the Michael May “Fireball Combustion Chamber” and transplant the engine and an aftermarket 6 speed manual trans into a 1995 Ram 5.9 V8 46RH.

Jags have well deserved bad reputations for electrical systems and iffy dealerships.

But I regret not doing that project “when I had the free time”.

Later I was “covered up” with other urgent and time consuming obligations.

Time.
You do not understand it until you get old.