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Mostly all of the DCT n54 Z4 owners I know have switched from Procede/JB4 to ESS. The flash is smoother, no hickups/fault codes/limp modes, its trouble free and harder to detect by the dealership and also you can flash your car at home via the the OBD II port with the handheld flasher. Also have in mind that ESS is for years in the BMW tuning industry ESS a pioneer and a guarantee for quality products and power.
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An ounce of performance is worth pounds of promises.
 
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