Is it an aluminator? Any work done to it? Phase upgrades? Need more details, not all stage 3's are equipped the same. What seats? Suede inserts, boost gauge etc. 4 piston brakes, 6?
Why are you selling? You are most likely bets off trading it to a major Roush dealer...they gave me 47k on trade of a 13 I had about 1 year ago, it had 9k miles. It's real hard to say what it's worth or what you will get....Without knowing anything in detail I'd guess yours is worth 43k range give or take a few grand
Phase 3 upgrade including CAI, Fuel pump voltage regulator, (629rwhp), 543 torque, Kooks LT headers with off road H pipe,ID1000's, Steeda Heat Exchanger, SCT tuner with custom Pro Dyno tune, BMR LCA's, BMR relocation brackets, BMR adjustable Panhard bar, BMR Rear sway bar, Steeda Aluminum driveshaft, Steeda X-brace, Steeda Differential cover, Steeda torque box brace/frame rails, Shelby trans cooler, Mcleod SS clutch line, RP fluids, whiteline transmission bushing insert and MGW race spec short shifter.