F8L Z71

Remember that not all mail-order tunes work right the first time.

Case in point one of my buddies dyno'd a guys STS equipt 4x4 5.3L and with a "particular" mail-order tune it only did 270-280rwhp baseline but after a complete custom tune on the Dynapac it did 385rwhp give or take.

Hell even seeing what comes of having 3 tuners in my area makes me skeptical of any tune. Just because it's "tuned" doesn't mean it's right. You can't really do steady state tuning through the mail and not very many shops have the capability nor the inclination to do so.

GMC_DUDE

I thought everybody said Nelson did not lock his tunes ????

Capped 5.3

Back from a weekend trip (not with my truck). Some of the feedback suggests i purposely ran a na tune for the radix. Give me a little more credit than that. This was an "updated" tune from Nelson for the radix.
Considered getting the pcm reflashed at the dealership but since they won't replace the cats i'm going to the original installers where i can get the new dyno numbers probably Thursday.
Thanks for the feedback and suggestions. Let you know what happens.