The X-60 will be T4 based.
What you saw on Brian's truck was just Brian trying things. He does that. You can fit anything with time and a Dremel.
Don't forget, what you see until the actual kit is in the box are just working prototypes. At times, you may see odd things on them. We try things to see what they will do. My X-60 has a rather interesting shock setup on it. It will never make production but it was fun seeing what it would do.