Would love to see some active aero on the next ACR. Automatic track extension that can extend at speed but retract at low speeds and be street legal...rear wing that can adjust for braking, top speed runs and cornering optimizations.
3-way shocks from MCS (or KW). Tune the heck out of the suspension to make it more inline with the most communicative sports cars out there (no more weird near limit gyrations in the rear and funny business that other reviewers/race car drivers have noted).
Steel braided lines. Carbon brakes. Oil catch can ready.
Torque vectoring diff.
Use the Tremec TR6070 if not a DCT (use 7th gear for overdrive highway cruising). And a shorter shifter if manual...the Gen V shifter is still too tall...love the MGW short shifter.
Trans cooler from ACR X.
Forged bits inside to allow the engine to rev to 7000+ rpm, with an optional Mopar cam/PCM to put the power up to 750hp-800hp (like the P5155872 drag engine).
Bigger gas tank too so one doesn't have to tow a gas station behind them. Must have wasteful burble of the stock 2008 Viper and optionally shoot flames out the side (Mopar PCM).
Michelin Pilot Sport Cup 2 please. Optional magnesium rim sets (must be replaced every year) or carbon magnesium rims.
GT3R body would be a fine starting point. Target the P1 and Porsche 918 (but not the LaFerrari since it is from a sibling company
) lap times around the 'ring starting around 1/10th - 1/8th the price.
Make the first 10 match the GTS-R paint schemes (5 & 5) limited editions and there should be plenty of people vying for them. Give a $25k+ paint scheme option that would allow people to sit down with SRT/Prefix to custom paint them from the factory. Beyond the first 10, all ACRs should be made to order, and factory pick up should be a standard feature.
ACR must retain the original Viper mission of scaring women and children.