need to use whatever size fits the outlet of your manifold and it seems I recall the stock mufflers are still in the system, check NAPA, they might even still list the head and tail pipes
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
and it seems I recall the stock mufflers are still in the system, check NAPA, they might even still list the head and tail pipes