Description 41922, 41927, 41929, 41934, 41886, 41941, 41943, 41952, 41958, 41961, 41973, 41687, 41981, 41989, 41894, 41898, 41879, 41998 Need help? Here’s a quick lesson on automotive exhaust pipe sizing. – Components such as mufflers, catalytic converters and resonators are generally measured in I.D. sizes. – Pipes such as extension pipes and tail pipes are measured in O.D. sizes. Although both part types possess the same advertised diameter, pipes are meant to slide into components.
