Don't mean to be redundant, however, I haven't seen this specifically addressed.
Bought a WRX this week. The sales manager stated that if the APS-COBB Tuning Club Spec Stage 1 (280hp) or Stage 2 (320 hp) engine mods are installed by the dealer, the standard SOA warranty would NOT be affected. Also said that the APS-COBB parts would be covered under warranty by COBB.
Any experience, good, bad or otherwise would be greatly appreciated. Stage 1 kit is on the way from Texas.