• Modifications or alterations which have not been approved by Subaru.
• Driver negligence, misuse or abuse, e.g. tampering, disconnection, loading or towing beyond Subaru’s specifications, or continuing to drive the vehicle after loss of fluids, lubricants, oils, coolants, refrigerants or water (Hitting 3rd from 4th/8000rpm = approx 10400rpm, yeah I would say that's loading beyond Subaru's specifications)
• Installation or use of non-genuine parts and or second hand parts, accessories, equipment, assemblies or components.
• Any work carried out on the vehicle by a person other than an Authorised Subaru Dealer.
Yeah I would say that the warranty is pretty F***ed.
But I don't know why he would even care, Dad will just buy him another one if it shits the bed, no big deal. Drive it like you didn't pay for it, F*** it wire the wastegate shut and put a pinhole in the map sensor line so it never boost cuts.