According to AFE literature the gains with their system is 87% better than oe, up to 10hp and 20lb/ft of torque. I have worked with Dinan on many upgrades. Their numbers are always conservative and based on dyno runs. First thing I did after adding Dinan modes was verify gains. Dyno runs showed a little 10% better than Dinan numbers. A tune is not needed as MAF will sense increased air and add fuel. More aggressive engine mods will require new engine software but not cold air intake. Even if AFE system draws some hot the increased volume is where the gain comes.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas