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My uncle has 335i with the JB4 upgrade and it is unbelievably fast. The JuiceBox upgrade is $500 and makes the 335's faster than M3's. Not only that it's not detectable by the dealership so no warranty void and it comes with 3 tuning settings.
That alone is one of the reasons I want to own one of the BMW's with the N54 engine. It also has an amazingly flat torque curve.
But 100 HP for $500!!!!
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