That was part of the reason I went with the SRT instead of the R/T. The 6.1 is stronger internally from the start, so Id assume it would take more power more readily than the 5.7.
Mod the R/T - just flashing for a custom tune - and you jump from the 87 octane with MDS to - 91 octane without MDS. Kind of defeated the advantages of having the R/T to begin with for me - not even considering the braking, exhaust and suspension differences.