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You can stick your Gunson Gas Tester right up your....exhaust pipe. Yes, pre-CAT. Post CAT numbers should be very different. It'll run and sound better if you use a gutted CAT and set the mixture richer than stock. Rich mixtures can hurt CATs.
Oh now I see you want to pass smog. Smog testing will be done at the tailpipe. So you should be able to see what they will see.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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