I think MSRP was about $45K on the SRT, so that would mean about 8-9% per year, but considering most dealers asked $50k or more, and many of them got it, if you paid $50 then youve lost about 40% in 4 years.
I saw a local dealer today asking over $70k for two of those SMS 570 challengers. Someone will take a hit on those.
These cars cant be considered investments for now. Talk to me in 20-25 years when youve kept the car original and put less than 50k miles on it, then you might sell it for close to what you paid for it.