I've got an old 833 behind mine, so no overdrive, but with my 3:55 rear gears and a 25.6" tall tire I can pull her right up to redline without much trouble. My speedo ends at 120, but I was probably doing at least 6k rpm if not 6200 (the redline I set), so that puts it somewhere around 130-135. There's another gentleman here that lives in Germany and drives his hemi swap on the Autobahn with no troubles.