I go at my HJC CL17 and it’s fits great! As I write this I’ve been wearing it for about half an hour just to really get a feel for it. It’s comfortable, although a bit heavy.
However me an the helmet don’t fit in my car. The problem is i like to have my seat back straight up and down, which only leaves about half an inch of head room. With the seat back laid back a bit it works, but only just. Thankfully the steering wheel does telescope and is in reach just fine, the only thing a bit out of reach isn’t 5th Gear but there’s no way I’ll be needing 5th gear in rallycross.