to the OP, read below:
I wanted to share two videos so that you can see the effects of the Supercharger, Coilovers and other mods..Later, I was able to improve my lap time by another second which you can see in my Youtube page..
In the first video you'll see how the stock car lacks the power when compared to a GT3 and in the second video how I can keep up with the same GT3 even after I took off a few seconds behind him(coincidentally same car and driver, in the same group, right in front of me),
of course I am not implying a FI BRZ with supporting mods is faster than a GT3 (possibly a driver error) but it's a good way to see the effects of the mods, since same cars and drivers, in a relatively controlled environment 
First Video (only mods, wheels and NT01 tires)- Track Time : 2:02.96
[ame="http://youtu.be/lvz-aYHuF44"]http://youtu.be/lvz-aYHuF44[/ame]
Second video (Kraftwerks Supercharger, tune, full exhaust, Coilovers, aggressive alignment ..etc)- Track Time: 1:58.79
[ame="http://youtu.be/Fa1UWvB-Lrg"]http://youtu.be/Fa1UWvB-Lrg[/ame]