First off the 2004 are now 220 hp cause of bigger injectors and new PCM. Difference between the 180 hp is in the PCM as it is less aggresive so the 180 hp can use regular gas. Yes, with stage 1 or stage 2 the 180 hp and 220 hp will have same output. Hope this helps U! 
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06 GT Auto, Cool Vanila Exterior, Presto Change O 3bl, Cargo Mat and Net, Billet Oil Cap, Yoko Avid 4Vs Tires, 03 GT Wheels, 4 Chrome Door Handle Screw Covers, MOPAR Mud Flaps, H&R Rear Sway Bar, Freedom Strut Tower Bar, Rear Door Sill Covers.
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