truthfully Mufflers wont have anything to do with the matting of the exhaust system i.e. factory mids or x ppe . If you are running stock mids then most popular manufactures of headers will mate up , but be sure to read fine print to assure that you do not have buy addtional parts i.e. adaperts/extensions etc... for them to work...But If you go with major manufactures JBA/Doug Thorley/Magna Flow/Gibson etc.. they will mate to stock midsHey everyone, I have a question for anyone who would like to help i have twister racing mufflers and want to get shorty headers will any shorty headers work on any aftermarket exsaust? thanks for the help!