First let me start by saying I have only tuned GMs so this is kind of new to me. I have a buddy with a 07 4.0 v6 who wants a little more power and a slightly higher top speed. I know the top speed and cutoff stuff, however, Im at a loss for the additional power. The tables are different than the ones Im used to. Anyone have any hints for me to help him out? I know adjusting timing helps but I cant for the life of me figure it out. What can I do? Thanks in advance guys.