carlh94, after I read your post, I did a little searching. I printed out a thread from a forum I stumbled across. There was someone who had dropped off a 2003 E55 at the Kleemann facility in Colorado for a stage 3 setup. The results will amaze you as they did me. If I'm not mistaken, the car came out with over 600+ RWHP. Let me dig around my recycling bin. I will either post or PM you the link when I recover those pages. The modes were ECU, pulley set, headers, and cams. Give me a couple of hours and I'll get the info to you. Wish me luck.