The US STI maxes out at 30 degrees of Advance. There are stops in the Cam wheels. The JDM V8's can run 40 degrees. I have spent extensive time mapping AVCS. On a Big turbo car i can produce 20-40 ft lbs of trq extra and my latest US STI Cam map is producing leading numbers. STI Owners with this map have been very happy with the top end power gains. On a Stock turbo STI the power normaly fades out past 6000 rpm. Most short shift because of this. With my latest cam map power is greater at 7000 then 6000. It really extends the power band.