1:72 metal exhausts for aircraft models solve what is arguably the hardest detail at this size: stubs about a millimetre across that styrene cannot be moulded open and metal can. Manifolds are tooled type by type. Opening a 1:72 stub with a drill thins the wall from the wrong side, which is the whole argument for a machined part: the brass pitots, barrels and tubes that work the same way are in 1:72 turned metal parts, and manifolds for every scale are collected in metal exhausts for aircraft models.
