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What Type of Dual Exhaust Needs Dual Smog Test Probes?

For a dual exhaust system, does an x-pipe or H-pipe need dual exhaust probes during the smog test? Or are the dual probes only for the true duals exhaust systems?
Answer:

You are correct. The smog technician must administer two separate exhaust probes into each exhaust pipe only on a true dual exhaust system. On vehicles which have two tailpipes but one combined exhaust stream, only a single exhaust probe must be used. It is important to note when and if a vehicle does or does not have an x-pipe or h-pipe exhaust configuration. posted by SmogTips Support

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