Hey guys looking to upgrade tuner. looking at getting an x4 and putting my mini maxx in the 6.4. My biggest question is that I'm looking for some input on who to purchase from. I would rather buy tuner from a dealer that writes tunes instead of just off eBay or Amazon. Any advice would be a big help as there are so many places that sell them now. It would be really nice to get one from a vendor on the site and put a little $ back in their pocket. I want custom tunes right away. Havent heard much good about pre written tunes. Any advice is a help.