Originally Posted by
bridge
Make sure you test drive the rig with your service rep PRIOR to accepting the repairs and cashing out. Make sure you floor it to WOT a few times. If you hear any popping or missing u-turn back to the dealer. $400 is a little pricey for two plugs and two COPs, but if you're not a DIYer its not that bad. The cats should be covered for 8yrs/80K miles.
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Yeah, I know that's pricey but I didn't have much of a choice since the dealer needed to diagnose prior to replacing the cat. In the future I will probably replace the remainder of the plugs and cops.