Would rate five if it had its own sound ;D I would recommend you adding a v6 swap and take the sound from the new pessima, that would be awesome!
I currently do not know how to do that, although the electronic engines do have only the turbo sound making them sound like a Tesla.
Look in the discussion section, I told another person how to get it, just follow those instructions :)
:) Thanks a lot - I am going to try to mainly make engine mods as there aren't many of them and I may decide to take engine requests. :)