lol no i built an exhaust for a f body 3 in single it sounded kinda mean at idle but after that is sucked i know i will run into the same issues with the regal thats why i hope to use 2.5 inch.If i get KR readings that will cause damage i will buy the headers asap guys i am hoping to get away with the 2.5 for now.Probably stupid but for one i have never even heard the engine run.