personally I like the 75-6 Bursch....not oem style though
It's heavy as and I backdated to the better flowing design first chance I got.
I converted my 76 to 2.0L SS heat exchangers way back when I needed a secondary muffler which was NLA. The 76 system has been in the attic ever since.
Very first mod I did to my '75 when I got it was to backdate the exhaust.
Might be desirable for late, later HEs and stuck with a Monza or similar exhaust. Dependent on cost.
Many people backdate because the late heat exchangers are rusted out and NLA.
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