Rewiring the race car.

"solderless butt splices, every airplane flying has them"
and I bet they are not hand crimped, and if they are hand crimped it is with dedicated ratcheting tools that crimp to a preset load.
its the crimping pressure that determines how good the joint is,
too little pressure, results in a weak contact with high resistance
too much pressure, the copper wire strands can fracture and break down over time again resulting in a weak contact with high resistance.