make absolute sure you are using above 100 octane fuel, especially if you are pushing the stock turbos. On the dyno, I picked up 12rwhp bumping the timing from 15 to 17 degrees. I'm assuming (and have seen some dyno posts) that 19 degrees yields even more performance gains. Advanced timing not only gives more peak horsepower across the power curve, but really helps the turbos spool up significantly faster (helping launch and quicker spool up between shifts). Mark