i went 15.2 with a tune/CAI but than again mine is 08

 

i went 14.6 w an ECSB dropped 4/6 20s in the front 26" slicks.
5.3 75k on it LT ORY tune magnaflow muffler 3:42s 1 wheel peel no stall no servos or shift kit.
but then again it was an 01

 

my cousin has a 2008 RCSB Z71 4x4 5.3 4spd ran 15.2 on 20's and nitto 305/50/20 terra grapelers. his mods are wheatley tune, cai intake, vette servo, and tb spacer.

my friend has an 09 cc gmc 5.3 6spd. ran 15.4 on 20's just a tune by wheatley also.. nothing else.

 

15.4 tune only?.... hmm i need to run mine and see what im working with...
do you have any more info on the 09 run? 60ft? mph?

 

id like to see a slip on that 15.4 with tune only....