This can create huge increases in power (at least as far as your engine is physically able to withstand) and has therefore become a very popular modification for UTV's like the Can-Am X3 and Polaris RZR Turbo. In the world of turbo-charged side-by-sides (UTV), they allow a complete control over the boost and behavior of the turbo charger. This includes fuel but also can be used to adjust (or remove) torque limiters, rev limiters, speed limiters, advance or retard ignition timing, override safety mechanisms, and more. The ECU flash is a complete rewriting of the code in the ECU that allows for much more adjustability to everything the ECU controls. For more experienced riders that have knowledge of tuning an engine and particularly those with access to diganostics and a dyno, these tuners are really limiting and can't really be considered a viable option for their needs. Because these tuners offer a very limited amount of fuel settings, they're often used by casual riders that are adding an exhaust or compensating for the factory lean condition that some OEM's have built into their ECU's for emissions purposes. Following the rules in their programming and settings the fuel tuner adjust the instructions for the fuel injector to add more or less fuel. When it comes to fuel tuners (aka fuel controllers), these simple tools plug into your fuel injectors and read the information being sent to the injector. If you own a turbo SxS, please note I'm only discussing the benefits of flashes and tuners on naturally aspirated motors because with a turbo only a flash should ever be considered.
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