I haven't posted in a while, been super busy with my degree. About a month ago my truck started having trouble starting. It would always start, but sometimes took longer than others. I ignored the problem until about a week ago my truck sounded different. The exhaust sounds so weird. Whenever at WOT I can hear the exhaust pipes rattling it sounds like. It also seems that the truck has significant power loss. I'm thinking it might be a cat. Any suggestions?