10.0, that's lean by Subaru standards. Most peg the wideband meter

I almost exclusively tune Subarus - and if you go lower than 11.0 - fuel gets beside the piston and makes it even worse...  This is a bad thing - and part of th ereason Cobb Stg2 = broken.

On the dual avcs cars i run them between 11.6 and 11.8 on stock turbo - with significant changes to intake cam advance...   Single AVCS cars from 09-14 I do 11.3-11.5 with close to 30deg int cam advance up until peak torque.

bigger turbo on those 08+ wrx is the key to keeping them together...  I have a few guys with sorta big turbos with 400hp or more 150K+ on 08 and up wrx's on stock engines/cams - those VF52 turbos make too much torque for it to last.

yes but most people swap to the VF52 since its ~400 bucks

anyone that has a 08 is instantly in the classifieds hunting down a vf52