The ECUs on these Mk3 RS are really quite locked down by Ford.
Normally changing intercoolers, airflow pipes, exhausts etc all add power but with this ECU they seem only to support the map to achieve its target and “not” to exceed that figure.
So if you have all the Stage2 supporting mods with an FPM375 kit you’ll still only get 375, but you’ll probably be able to achieve that all day long.
In a similar way if you have a 400bhp map and all the supporting mods you’ll still only be 400 but will be able to run that for a far greater time safely and without the car backing off the timing and boost to protect itself.
Also the supporting hardware does look pretty ??
RS Edition.
FPM375 Rocks
The rest of the “M” maps suck