The 300 PS engine was quite a lot different from the 280 ... there were some internal changes to valves etc. to allow it to rev higher IIRC ... I don't know what I'm talking about really but I do know that it wasn't just a remap !
although this is advised a TC system work on the speed difference on each axle so if you stay between the percentage difference in size irrelevant of the oem between each angle vdc etc will be fine
agreed