Yeah, that was kind of my point that you would have to change or modify it. It depends on the trans but I know that DSM's "require" it at around 10k rpm, and it is a modern trans. So a "1950s" v8 trans, which is designed to be mated to a motor that in factory form spins almost half as fast as a DSM does, is more likely to require modification at a lower RPM.
I dont think anyone has attempted to rev an S4 trans high enough for it to be a problem, highest that I know of is 9k. 500tq @ 10k, ha i wish, more like 200