Pulley'd up to a 3.5 still have 3° of knock at WOT. I also lost 2-3lbs of boost at WOT. Maybe its the weather? But 3° of knock with headers something doesn't seem right. I got new stock wires, al104 180tsat my o2 isn't hitting the firewall... 207k miles no check engine light. I'm still waiting on a tune.