OK been out, kept O/D off and took it to between 6k rpm 6.5k rpm, no problems, tried it a few times, never hit anything like a second limiter, although at 5400rpm it's not at 112mph, or just on the verges of it (was keeping my eye more on the road and rpm clock and not the speedo tbh)
Don't know if this helps at all, probably not lol, but hey, I had fun :D