rob777 Posted March 17, 2015 Author Report Share Posted March 17, 2015 I haven't tried it on the higghwY last truck with flow master droaned me to death. I Like loud I'm hoping it won't droan to bad. I did get a 520 code on the way to my buddies. I chalked it up to cylinders missing and not sending enough heat on that bank Oops I mean p0420 Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted March 23, 2015 Report Share Posted March 23, 2015 More often than not with these trucks you will get a Random Misfire P0300 before any cat codes set when the cats begin to fail... Quote Link to comment Share on other sites More sharing options...
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