Boy, I've been completely mistaken this whole time, based on what you guys are posting and based on the pictures in Post #29 the rear spoiler is apparently made up of multiple pieces. I thought it was all one piece all this time...... Whenever the Z51 spoiler was mentioned, I thought of a spoiler that didn't stand up nearly as high as the Stage-2 & 3, so I thought it was a completely different spoiler. So, if anyone ends up stuck with a Stage-1 who wants a Stage-2 as the result of constraints can get one by changing out only part of it through the parts department at a later date? That still doesn't resolve the issue with the front splitter though. I'd swear the Stage-2 & 3 front splitter stands out further and is a completely different piece, only the difference between the Stage 2 & 3 is just the end caps....