That's like saying the New Edge was a new chassis compared to the 94-98 SN95 lol. The S550 was a new chassis, the 2015 "update" was not.
More like 2013 GT500 vs 2005 GT.
The if anything, the 2015 updates made the Challenger superior to the then new 2015 S550.
Tr6060 > MT86
A8 > A6
Uconnect > Ford Sync
Dodge Seats > Ford Seats
Hell, even with the 2018, I'd argue the A8 > A10.
So sorry, not gonna nut swing a chassis simply because it's "newer".
I'm honestly not looking forward to the next generation Challenger, seems like a lot more to go wrong instead of improve. I've still not warmed up to the S550.
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