What's really interesting is when people take an actual lawn mower like the Kei class Honda Beat with its 3 cylinder 7k RPM mid chassis engine and engine swap it with a 200HP motorbike engine to get one of the most insane sleeper cars of all time.
I used to have a VW Polo that had turbo upgrade, full muffler refit, high flow cat, pod filter, tuned ecu, upgraded brakes, tires, adjustable suspension. This little thing looked like a basic nothing. Stoc standard white paintjob piece of rubbish, sitting silent at the lights. Until you punched the pedal, then it'd roar like a dragon and take off like a damn rocket. It wasn't anywhere near as good as my Golf R overall, but it was a stupidity fun little go-cart.