While an Intake or Tune isn't an instant warranty-voider, a blow-off valve definitely is... On the Focus ST groups Kev and I were warning a guy not to be screwing around adding a BOV and messing with the wastegate without a reason for it, it was hard to feel sorry for him when not even three days later, he messed up the wastegate he was effin around with, overboosted the motor, and blew up his motor and was denied the claim, leaving him with a $6k motor repair.
I'm glad you enjoy it and are realistic about it, but please be careful with what you're doing