A manufacturer tends to use a map that is a compromise for different climate regions. Hot climates and cold climates. There are variations they would put in sometimes for sufficient sales volumes or specific requests from dealers/customers. I once owned a Ford Focus that you could buy with two power output options. I researched it and concluded that it was simply different mapping. No component changes just map parameters modified. This ability to tweak mapping is the basis of the aftermarket chipping business. The true correct way is for a rewrite of the map under both static and on road driving. Small gains only in a normally aspirated engine but turbo allows more by increasing boost as well. Bigger power increases require new cams, valves, other component changes. For the Plus8 I think the Tornado chip is a proven remap modification that can increase power and improve general running characteristics and cure some faults.
