Only if you completely ignore the tune-up and car modding scene. On the BMW side we have the G-Power G6M V10 Hurricane CS (based on the M6 Coupé), for Mercedes

Only if you completely ignore the tune-up and car modding scene. On the BMW side we have the G-Power G6M V10 Hurricane CS (based on the M6 Coupé), for Mercedes there's the Mansory Black Edition (based on the Mercedes S-class/S 63 AMG), Underground Racing uses the Audi R8 V10 TT for its 1500 HP machine, the Porsche 911 has a 9ff F 97 A-Max incarnation with about 1400HP and the 9ff GT9 V-Max. The 9ff GTurbo comes in at a mere 1200HP, based on the 911 GT3 and there's more. So no, in the car enthusiast scene even 1MW is is not uncommon. And that's not using Lamborghinis or Bugattis. You'd be surprised how many street legal modded M3s, S-class and 911 have 800kW or more max power (at least in Europe). Edit: shame on me - I forgot the Tesla Model S Plaid. Those have straight up 750kW electric power trains, too.