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I ended up getting the JB4. Considered the dinan as my local dealer installs and warranties. The JB4 isn't a true ECM tune and can be removed prior to going to the dealer for any service work. It's essentially the same thing as dinan but in my case was about $1500 cheaper. The research I have seen is that the power is better with JB4 and still quite conservative if worried about premature engine parts failure. I would get the JB4 and never look back to be honest.
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2018 M550i
2005 330ZHP
1996 M3
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