Talk:Tuning Shop (GT5)/@comment-2.99.238.189-20120605194349

New to GT5 - I've got a stage 3 engine upgrade and I can't fit it yet because it says parts have to be fitted in a specific order. Does this mean I have to buy the stage 1 and 2 before? I don't want to buy them just to find out it's something else. Anybody know what I have to do to be able to use the upgrade?