As far as I know the 2TGEU ECU does not have a built in revlimiter. It should be fine to Rev to 7000 RPM (The redline of the 2TG) but this is probably flogging a dead horse due to the lower compression and reduced lift of the Stock EFI versions. I would think something like 6500 RPM would be about as far as you want to go. A good dyno tune will show you were you make peak power and so you will then have a much better indication of where to shift.
As far as the point of things going bang.. The occassional 8000 RPM should be ok but is totally pointless on a stock engine and will do alot more harm than good ! A balanced and rebuilt stock bottom end tho will handle 8000 RPM regularly