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Are you planning to do tuning yourself or have someone else tune?
IMO Diablo Sport tuners are very limited in terms of capability for the DIY'er but are more than adequate for tuning via email.
On a stock motor, you might be able to free-up some HP. Typically what I have seen are the tunes usually are tweaked to give better throttle response and to reduce the amount of timing being pulled (i.e. knock sensors are desensitized, tip-in timing retard is reduced...ect). Most tweaks are also done on WOT tables where NN (neural network) is no longer controlling things. Basically the stock tune is developed to have some safe operation and fuel economy in mind. With a custom tune you are trading off this for more power.
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2015 Challenger RT+ (non-STP)
8lb Magnuson w/ Innovate PSB-1 wideband/boost/shift light gauge
Corsa extreme (2.5")
4" Aluminum one-piece driveshaft
Hellcat bottom airbox
Stainless Works LT headers (2" primaries)
Barton shifter assembly w/ Lou's short shaft and Speed Dawg knob
Comp Cam 7929 & 7748 push rods (gives slightly more lifter preload)
A2speed aluminum coil and valve covers (built in catchcan)