I have had the J/A since shortly after it was released for the 6 spd. No problems so far and I love the cool down feature. Just make sure it is v1. 1 and it will work with the 6 spd. , 1. 0 is for auto's only. I think everything from May 2006 is v1. 1 so I doubt any retailers still have the v1. 0 and iirc all it did was set a check engine light on the 6 spd trucks.