HI there,
In Flow's Career you have to build your way up. For the extras like the running shoes and the stereo you have to play the ENDLESS SHIFT then as your playing that game you will get an upgrade icon on the top. When you click on that you will be givin choses for diffrent things you can up grade to.
It's fun but i get board with that one. I
am now on my 4 diner and stuck once again I can't get passed the 10 lvl.
But hope this helps you.
Have fun
Jo