Do you guys redline?

[pothole]

I very rarely actually take my 2.5 to the redline (6.5k in a 2.5), but after it has carefully been warmed up, it's gets revved to 6k pretty much all the time.

Once your engine is warmed up, you're going to do very little damage revving it. I wouldn't have the car sitting near the red line at constant rpm. But in terms of reving up hard through the gears, I say go for it. My car gets nailed through first second, third and fourth pretty much every time I take it out. Currently has 95k on the clock.