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OP another thing to consider is the SXT and RT have longer service intervals when it comes to oil changes (max of 12 months) whereas the SP requires more frequent oil changes (max of 6 months).
Also, you probably will go through more tires (and possibly brakes) with an SP or RT than and SXT.
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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)