The MagnaFlow Rumble muffler with a 14" body and 19.5" overall length is detailed with a 9.75" body width and a 2.25" offset/center inlet configuration. It’s provided as a physical-specification option for exhaust systems that need the slightly larger body width and a modest off-center inlet placement relative to the centerline. The Rumble designation indicates the muffler family and intended application context.
Magnaflow Rumble Muffler 14in Body (L) 19.5in Overall (L) - 9.75in Body (W) - 2.25in Offset/Center