I think it has Icon like this -snip-
You see "Challenger R/T" logo on the grill
It also has Dodge on the taillights.
And about the R/T - it's just name of the modification, for example Dodge Challenger SRT has SRT instead of R/T on the grill. So it basically just depends on which exact model NightHawk modeled. And because I think there is no need to be so exact and since Night Hawk put a bit of his own style in the car, aswell as he wants to imprint his name on the car somewhere, instead of R/T (or SRT) you can put something like
NHE, AKA
NightHawkEdition. Here's a quick sketch I thrown together in Photoshop:
