A friend of mine has a double cab tundra and it's no slouch. He's been LOW 14s on factory tires with just the TRD cold air kit, the rear cats removed and different mufflers. My SSS ran a 14.50 before headers/tune/stall and he ran a 14.22 the same night. He can't dead hook WOT off the line either. I've seen single cabs run high 13's with the same mods he has.
This is him running a 14.27 spinning out of the hole (yes I know that VHO was asleep at the light)
http://www.youtube.com/watch?v=eQFkZF4jOb4
2005 Silverado SS AWD
AEM CAI, ARH LTs, HD-2 shift kit with vette servo, Circle D 278mm 3200 stall Madtunesracing.com street tune (MTR now has a Dynojet 248 chassis dyno)
13.82 @ 94.92 w/1.83 60'