There are 3 or 4 levels of fuel augmentation now available - a brief overview:
Basic:
Accelerator module - a (usually) fixed resistance, inline with the air temp sensor - to fool the fuel injection that the temperature is lower than actual. This richens the mixture under all operating conditions.
Half-way:
Techlusion unit - This adds fuel under different conditions, and can be "tailored" by the rider. Best set up on a dyno, to get the A/F ratio as close to ideal as poss.
Power Chip
Think this was the first mod - on the scene, back in 2003-ish. Basically a different chip to suit a free-flow exhaust and air filter.
Power Commander
Fuel mapping - which can increase or decrease fuelling according to requirement. Best set up on a dyno, but there are generic maps available from the Dynojet site. Latest versions (PC5) can map individual cyls and also be set up with an Auto-tune unit.
Remapping
There are a few facilities available for this - which is the most elegant solution. (Hilltop Motorcycles and JHP Racing to name two). Overwrites the maker's map and in some cases - is undetectable by the dealers (other than possibly - a better A/F ratio than standard (lean)
Al