i have a 2002 5.3 silverado with an sts turbo kit, diablo tunner, and some goodyear gt2. i ran the 1/8 in 9.5 at 5psi. but i want better what should i do next to the truck so i can get better times and more boost?

 

ditch the diablo. get a dyno/street tune. That's what i would do anyway. you need to shave at least a second off that 1/8 mile time. 9.5 is about a 14.8 1/4mi

 

Besides the tune you will need fuel system upgrades and cooling to run more boost and tranny upgrades.

1.) bigger injectors - 42# 8.1 marine or 44# multecII or 42# Ford.
2.) fuel pump - 255LPH in tank or in line fuel pump by Walbro for one choice.
3.) spark plugs - NGK TR6 gapped at 0.035
4.) cooling - and IC or Methanol injection or both
5.) data logging/tuning- to log your engine's operating stats and to keep it safe.
6.) tranny - shift kit and servos or performance built
7.) gauges - Boost and Fuel pressure
8.) boost control - manual or electric
9.) traction - limited slip diff, ET streets or drag radials
10.) other? - I know I must have left something out. This list will never seem to end.