Second the black bear tune. They send you a thing that monitors your driving, you tell them what aftermarket parts you have on it and then they send you a programmed ecu specific for your motor and driving type
Plus u wouldn't know the trans torque limit factory.
It's insane how much its limited
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I had an 08 GM with the 5.3. I put on an aftermarket exhaust and when it kicked down to 4 cylinders it sounded like a rice rocket. I loved the sound otherwise so I asked the guy at the parts dept and he put me on to a custom engine shop called Campbells Automotive.(not sure if they are even still around) I had them disable to 8-4 cylinder drop out, he then did a custom tune including fuel mapping, transmission shift settings, removed speed limiter the difference was unreal and no warrenty issues. I was hoping for a little better mpg but there was no change. cost was just over $400 and the best part is I sold it to my dad when I got my company truck so I still get to take it out once and awhile. If you could find someone to do a custom tune I would totally go that way.
Did a quick search on s and m and didn't see much come up. I have a 2008 chev with a 5.3L. What is my best bet? A lot of folks on the Internet suggest going with a custom tune. Any thoughts or experiences?