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Originally Posted by AlexM240i
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The JB4 is easy to install imo as well. The Dinan tune only does one sensor and doesn't provide data logging. The JB4 has the added benefit (should you get the Bluetooth adapter for it) to open an app on your phone to change maps, data log, firmware update, temp gauge, and other gauges as well.
Basically if all you want is a tune and CAI, sure go dinan. If you want a catless downpipe, tuning support, updated tunes, multiple tuning maps in a single device for no additional costs, best option is the JB4.
Dinan has a name in BMW tuning, but they built that reputation when the original founder and CEO was still in charge there. I've heard mixed reviews about their stuff since he left. Burger tuning also has a name in BMW tuning. And if you want to argue any warranty status, having to fight between Dinan and BMW on who's going to be fixing anything is something you'd have to deal with and I've heard is tiresome.
I'm sure I missed some advantages of both but those are the major ones.