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Discussion Starter #1 (Edited)
I’m curious if this is a sign of a cat going bad. I have been smelling a slightly stronger oder from the exhaust... not a rotten egg smell. There are engine codes showing. But I have also been getting knock re-tard as high as +5 in part throttle and at wide open throttle, both on stock spark tune and MPT PRX91 tune.

Any help would be great. Thanks. See YouTube vid.

https://youtu.be/2hXqmMC6Okk
 
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