yep, they'll fit.
nope, the tuner is only used to prevent CEL with the new o2 sensor data. You may get CELs - if these are long-tube headers.
With shorty headers, you won't get CEL, but then again you won't get the gain you will with LT headers.
2011 Charger R/T Plus AWD
Tungsten Metallic -- Fully Loaded, Spoiler Delete, Sunroof Delete
Done: DS Trinity; Corsa Extreme CB; Edelbrock E-Force supercharger
; Illuminated Door Sils; 15% Tint
Sound: Two Infinity KappaOne amps pushing two SSA GCONs in self-built tuned & sealed box