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The restriction in the factory exhaust is the cats, not the manifold itself. I just installed 2" Kooks long tubes and catless mid pipes last night. I'll do a write up once these pics upload.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C
1980 Z28- resto-mod project
1979 Y84 Trans Am
1986 IROC-Z
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