If most of you saw stock afr's you would cringe and wonder how the car dosnt blow up at wot on stock tune. If you ask me, it's only a matter of time before the stock tune cracks your pistons. Most of you say your car is stock and never have problems. As long as you dont go into full boost under 4k your fine..
And for the above poster who said they got an STi over a WRX for power your wrong. Stock for stock they can dyno the same and or the wrx could be more than the sti. The 265/305 hp is a marketing scheme. Protune for protune they are very close. The 10k more you pay for the sti is for everything BUT more power. In the US HP numbers do not apply wrx vs sti, thanks to the stupid US DOT regulated econo tree hugging tune..