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94cobra69ss396 · 09-04-2013, 09:05 AM

Like Damian said, check the cats with a temp gun. Run the engine at around 3000 rpms for a couple minutes and then check the temp before and after the cat. The temp out of the cat should be about 300 degrees hotter if the cat is working properly.

09-04-2013, 09:05 AM	#5
94cobra69ss396 Fast & Filthy Join Date: Jun 2008 Posts: 3,840 Tweet	Like Damian said, check the cats with a temp gun. Run the engine at around 3000 rpms for a couple minutes and then check the temp before and after the cat. The temp out of the cat should be about 300 degrees hotter if the cat is working properly.