Interesting about the Mustang issues. It appears to be a similar problem with the 3.6, coupled with poor materials/QA. Last time i checked they were on their 3rd revision of the problematic head, with folks reporting issues on the the first and second revisions. I started a thread here
to raise awareness as I hadn't heard too much from Challenger owners, but if you go to the jeep forums
, there are hundreds of posts/videos/insights on replacement heads. No TSB from Chrysler yet, and unlikely they will issue one (looks like they are trying to cover it up with flashes that raise the number of misfires to trigger a CEL). The most affected builds appear to be from mid to late 2011, but could certainly be affecting any build prior with a first gen head. After late 2011 they started building them with newer, more "robust" heads. There is also a large backorder of replacements/remanufactures, many people reporting having to wait several weeks. This is certainly as it affects most, if not all of the new v6 cars. IF you google "pentastar replacement head" you'll see it received a bit of press back in Aug of last year, but nothing since.