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My boss has the Livernois tuner on his 3.5EB F150 and it made a huge difference obviously because it's turbocharged. I've heard a lot of Mustang guys love their tuner on the 5.0. The other reason I will go with them if the lifetime retune they offer. So, I can get the tuner now, then a new one when I cam the car, LTs, etc.
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