If tires weren't so damn expensive right now I would be doing rolling burnouts daily.
For comparison here is a stock(?) Charger Hellcat on a drag radial. She is a regular at the track so this is pretty indicative of what normal Hellcat performance looks like here.
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Yes, that is my 13.
Your modded 13 second HC to her stock 11 second HC? Granted there 1.3+ locked up in the 60', but still if this is the case shouldn't your mph be higher?