Got a 5.3L 01 1500 with 3.73 gears, k&n intake, magnaflow cat-back, and dyno tune.
stock tune run was 255whp
and with dyno tune results were:
261rwhp/303rwtq
only a 5whp peak gain from the tune, but the results were huge threw out it. it pulls so much harder down low.
this thing spins from punching it at 20mph with tc on!

totally new animal