I just finished doing a flush on my 03 6 liter. I started with Restore, then followed up with Restore + and I was amazed that my coolant was squeeky clean. I acutally considered not putting in the EGR delete, oil cooler....considered. Granted I have already purchase the items, they are going in next week. FICM is on it's way to ED. MY FICM is perfect, but I figure money well spent plus an atlas tune. I also have a coolant filter kit plus the blue spring mod. Gonna be a bizzy week