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I had an ESS tune on my 5.0i for a year before trading it in. Zero issues for the 12-15k miles I added from ~38-53k. For about $1k, it was an awesome improvement. Can't speak to long term reliability though.
Last edited by Molez93; 06-11-2018 at 08:48 PM..
Reason: Confirmed it was/ is ESS
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