Description 41855, 41923, 41928, 41930, 41932, 41939, 41942, 41949, 41888, 41955, 41854, 41959, 51065, 41962, 41999, 41974, 41982, 41563, 41984, 41909, 41997 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.
