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While I'm not sure of how close it is on the 2.7, I owned a 2.3 EcoBoost Mustang with the FPP tune and JB4 respectively. The JB4 allows you to run E30, which alone sealed the deal for me. The JB4 certainly felt more aggressive in the higher maps. No, the JB4 cannot flash the trans, but sometimes...

Install isn't bad at all for those who are mechanically inclined, the 2.3 leaves you plenty of room to work with.