I'd bet the o2s were picking up air with the cutouts open.
When my LS setup was open header, it hated life unless I disabled the o2s.
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction"
1970 Trans Am RAIII 4 speed
1971 Trans Am 5.3 LM7
1977 Trans Am W72 Y82
1987 Grand National
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