I currently own a 2004 Mustang GT, I have the diablo predator tuner with the custom tune it came with installed, also I have 4.10s, under drive pulleys, cold air intake and weld in flows. I'm going to order a full mac exhaust, long tube headers, pro chamber, and mac cat back, with the new additions to the car, will I need a tune on a dyno or anything. Will it be running really rich or really lean? enough to harm the engine? Problem is, where I live theres no wheres at all to get a tune.