Just a thought on my part
I hope that they didn't do that to a lifetime warrantied Magnaflow
because if it ever goes bad & they have to take it off & ship it to Magnaflow to get the warranty replacement muffler, they will discover the modified muffler & deny the warranty do to improper installation.
if it is a Magnaflow, have the shop give you something in writing so if that should happen, they would be responsible for the failure
2009 Ram 1500 SLT QC, HEMI , 3.55 axle, Bushwacker flares, soft tonneau, Line_X, DEBO Step, Mag-Hytec, Weathertech mats
2016 Ram 3.0 diesel 3.55 w/LSD, G2 tonneau, Line-X, Weathertech mats, Mag-Hytec differential cover, Nfab bars, CB radio, Autonet wi-fi router, EGR bug deflector