I can't speak to Tone's design, but I got a similar one built and yes, it offers a ton extra room, the problem might be that the seat can no longer go that 4.5"s further back and that can be a problem, I have plenty of friends that still fit fine on my front seat, but their head could be a little closer to the top of the car now or knees closer to the console....

I ask my passengers to go Gangsta Style and put that seat back if they are too tall!!!!!

Hope that helps!