Im new here im 19 and have a 93 atx. in april i had a hole in one of my mufflers and my "ash pipe" (is what meineke called it not sure if thats what it is) was falling off and apparently rotted completely. so they replaced both mufflers and from the y pipe almost up to the rear split. seemed great they welded it nice sounded better than when i purchased the car but they replaced the flex hose with straight pipe. after about 3 weeks the bolts vibrated loose i brought it back they told me they "did me a favor and saved me money" they tightened it again with more washers and spring bolts a month later it loosened again. I will bring it back to be fixed again. its is covered under warranty should they have to put in a new flex pipe for free? does it HAVE to have one? and could the lack of flex have hurt my y pipe or manifolds? im just a kid i dont know too much but love the car any help would be greatly appreciated 
