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Discussion Starter · #1 ·
Well took my BLACK 85 SUPRA back to emissions and passed with no problems after modifying the exhaust to fit the larger 17" cat compared to the 12" cat .Time to place straight pipe back in and save the magic cat for next test 2 years from now.


BEFORE CAT GHANGE
HC 1.6146 GPM MAX 1.800
CO 7.7911 GPM MAX 30.0000
NO 3.8769 GPM MAX 2.800

AFTER CAT CHANGE
HC 0.0207 GPM
CO 0.1348 GPM
NO 0.0207 GPM
 
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