Srt-6 Gang member is exactly right as soon as our cars start hitting 20 plus pounds of boost they want to lean out bad. When I had my dyno tune done by Ton with stock fp and fpr. After 1.5 hours the best he could do at the top of third was mid 14's afr. Now that I have a walbro fuel pump and AEM fpr that has a 1-1 increase for boost I am able to hold AFR's into the 11's if I want. It takes a increase in fuel pressure from the stock 60 psi up to between 72 to76 psi. There is a fix for this it just takes time patience and money to make it work. Talk to Rob at NW for more details.