What Ken says and what he actually does has been different several times in the past. I'm not trying to throw him under the bus, but my DPS turbo calibration IP was a 3200 pump. Dyno sheets in the sticky at the top of the IDI page.
Heath
Mine goes to 3800..... My dyno run doesnt show it though because the operator didnt know the limiter had been adjusted so he let off around 3300. that said, unless you sled pull i see no smart reason to run it above 3k'ish. i know i find myself talking nicely tl my pickup after pulling a big pass at 3k with trailer in tow.