Unless it is pinging, you do not need superunleaded---you may try a tank to see if the "feeling goes away".
The Diablo Predator is a great tool----I use one on mine, which is supercharged.
However, a Diablo does well on a stock engine too---it also allows for real time monitoring of your engine parameters. It can adjust many parameters to make your truck run great, including torque management.
They are pricey but worth it--you can also download custom tunes to your laptop via the web and upload them to you PCM.
Without boring everyone, send me a PM with your number and I can give you a lot of info before purchase.
Also, it takes a number of drive cycles until your PCM adjusts to your new add ons-----this may cure your issue---the predator is still a good investment though.
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