[rowdy]

As has been said there's not a great deal of point as the engine is more torque than power. As has also been said it will stress the engine more than desired.
Case in point, apparently there were a few k3's that slipped through the net with the rev limit set 1000rpm higher than should be (according to co founder of dynapro who dyno tested race bikes for the minitwin series) mine being one of these bikes (tested on dyno by said dynapro co founder) and after 5 years with the last few months of those seeing the bike reving towards 11500rpm more frequently than it should have to be honest, resulted in one snapped crankshaft. On the upside though the bike was capable of a speedo indicated 10mph more in top gear than before the race exhaust system was fitted, which allowed it to rev that extra 1000rpm in top gear. That said I don't think it is that great a benefit with regards to acceleration.