In a letter to dealers, chromed tailpipes were announced a standard equipment revision effective May 19,1969. Option prices for N10, Z27 and Z/28 were increased accordingly.
The same letter notified dealers NC8 chambered exhaust was dropped as an option as of the same date. Orders in the system as of that date would be built with production exhaust. Chambered exhaust never had chromed tailpipes.
An anomaly I frequently see on '69s claiming to be "concourse restored" are incorrect exhaust systems. When the chambered recall was issued November 25, 1968 it stated L34 & L78 cars would now be built with the standard N10 muffler/resonator system. Z/28s received a unique system w/o resonators using the same "deep-tone" muffler used in '68. This was still too loud for certain areas and as of April 15, 1969 Z/28s reverted to the muffler/resonator system.
Despite being well-documented, many of the restored '69s I see, bb or Z/28, have a single muffler/no resonator system. That's never correct for a bb and only correct for a Z/28 built during the aforementioned time frame. Chambered remains possible for cars built prior to May 19th.
How is this handled in judging?