I'm just over 90K on my 2006 Mustang GT, and I've been wanting to get the plugs changed out along with rest of a tune up done on it. I'd normally do it myself, but between the lack of time (live in MD during the week and only home on the weekend) and the horror stories of hearing plugs getting snapped off (I have one of the engines affected by that) I was planning on taking it to the dealership..plus it needs a recall done and I have an annoying rattle that needs to be looked at (have an extended warrenty), so how much should I expect to pay to get this done?