The MagnaFlow Rumble muffler with an 11" body and 19.5" overall length is specified with a 7.75" body width and a 2" offset/center inlet configuration. It is intended for custom exhaust layouts that require these compact body dimensions and a centered inlet offset. The Rumble series designation identifies the muffler style while the listed measurements guide fitment into the intended exhaust run.
Magnaflow Rumble Muffler 11in Body (L) 19.5in Overall (L) - 7.75in Body (W) - 2in Offset/Center