As the title states I have a rattle like sound that can be heard thru the exhaust. System is as follows: wrapped header to wrapped ORP to cfm flex to magnaflow cat back. All gaskets are brand new and slipjoints are sealed with exhaust paste. I can't for the life of me find the source/cause of rattle. It doesn't do it under smooth acceleration. Only when you go WOT from 2000 to about 3500 in 2nd and 3rd. The sound is metallic and similar to what you would expect a loose hose clamp around the exhaust tip to sound like. Heat shields are all snug and removed in a few places. Has anyone experienced anything like this? Is it possible that sound is coming from the engine and I hear it in the exhaust? I know the ORP is raspy but if this was rasp I don't think anyone would ever get one. Any and all ideas are welcomed because I'm completely out of them. Thanks.