This has been suggested before but it was more than 2 years ago so I guess no one cares about that post anymore.
2007 Melling Hellcat, aka that weird thing from Juiced 2 aka something that was supposed to be the fastest car in the world but didn’t quite make it. No idea about the lore name. Also it was designed by a former TVR engineer so it has to be mad.
Should be around 5-10B in terms of pricing, and as for performance somewhere in the upper S class (95-99) with more straight line speed priority, cuz, you know, 1220hp quad turbo V10. Claimed top speed was 475kmh for this one but ~425 should be enough for game balancing reasons.