Don't tune it.
Wait til you get bored (like 18 months from now) then tune it.
Otherwise 18 months from now the arms race is going to start again and this time you'll jump off at 550 HP and 100 grand price (basically Jay's mk6)
This seems like the smart way to do it. Or maintain the warranty, buy some RT660s, and go hit up some autocross/HPDEs