Your story is interesting. The pervious owner of my '69 Z28 purchased the car in his home state of Connecticut in 1989. He has lived in Indianapolis for many years where I live. I purchased the Camaro from him in 1995 and started the restoration, which at that time, the car only had 44,851 miles. The 1989 emission decal from Connecticut was in the front windshield with a "FAIL SEP 18 89" stamp. The car had headers and an aftermarket exhaust system, and the carb was jetted rich. So, now wonder it failed the emission check! For fun, I attached a picture of this decal. The document in the background was my title search and attempts to fine the owner history which came back “No record of ownership exists for the follow described motor vehicle..."
During the late 1990s, I attended the Camaro Nationals in Pigeon Forge, TN to look at well restored cars, and studied two ’69 SS Camaros side-by-side. One was a survivor with its original GM chambered system and the other car with a repro system. The difference in sound between these chambered systems was remarkable. The repro system sound much more poppy and did not have the same deep tone as the original system. The original system obviously has many years and miles on which may have been a factor. Gardner’s system should be a good system and should sound very close to an original GM system. So anyone wishing to purchase a chambered system, I highly recommend the system from Gardner versus a cheaper alternative system.
Back to the resonators: at the time I resorted my car, Gardner Exhaust was either not in business or not well known. I purchased my complete transverse muffler exhaust system (again, my car is a 05A car) from the former Rick's First Gen. It was a nice system but does not compare to the Gardner systems available today. I searched for a long time for resonators but none were available, so I had to install the resonator by-pass pipes.
A year ago, I contacted Gardner to ask about purchasing resonators but they only sell complete systems. Heartbeat City Camaro Parts currently has a set of NOS resonators, G/M #3909959, for $1,750. Here is link to the website and item: http://www.heartbeatcitycamaro.com/store/product/22785/Camaro-NOS-Exhaust-resonators-3909959-69/
. If my car was a #s matching rare car that was never driven, this might be a good investment. I attempted to verify the #3909959 part number but the ’69 assembly manual shows them in the illustration, but does not call out the resonator part numbers on page 388, for the dual exhaust N10 option.
I look forward to seeing pictures of your exhaust system and hopefully some details shots of your resonators. I have several sound bites of my car’s exhaust sound w/o the resonators and would like to hear yours with the resonators in a side-by-side comparison. Gardner’s website provides a number of sound bites, but I am not sure if the “1969 Camaro Z28 Deep Tone” sound bite includes the resonators. I intend to call them to ask.