I was able to switch my 6 wide Porsche 911 RSR 75888 to 8 wide. It wasn't so difficult. Basically, you just have to follow the instructions, adding two wide in the middle and one in the length. I used a Trans-Black Windscreen 3 x 6 x 2 and, for the wheels, a Technic Brick 1 x 2 with Hole. The result, to be honnest, wasn’t so nice as i espected. I just hope the newest 8 wide models be well done.