Don't mess about. Keep the nannies on. Go to AutoX and HPDEs and learn not only how to drive fast but also how to understand and feel your car.
The best upgrade is a Driver upgrade!
Oh, and when your friends are a-hootin' and a-hollering for you to do a burnout, don't.
Have fun!
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"Sweet Subaru, sweet Subaru, send your BRZ unto me, for the roads of the unworthy must be baptized in speed and glory."
- The Ancient BRZ Sacrament by Zaku