A complete overhaul of the original design. Raw unadulterated power only rivaled by its own fuel consumption. Bring spare gas.
A gearbox customized for better off-road performance, sacrificing gear count, top speed and fuel efficiency but offering three Low Gear stages.
A thoroughly reworked variant of an outdated engine. Increased power output at the cost of reliability - physical damage tends to make it lose power and consume more fuel much sooner.
An advanced gearbox sporting many functional improvements over regular variants such as higher gear count and top speed, and an added High Gear at the cost of lower reliability.
A heavily tuned, custom-fit engine by a popular vehicle workshop. Respectable power with a somewhat unhealthy appetite for gas.