Supersprint knows how to transform the 2010-2016 BMW Z4 35is into a 400Hp monster.
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https://www.supersprint.com/ww-en/supersprint-performance-sport-exhaust-bmw-e89-z4-35is-sdrive.aspx
All this car needs for meeting this goal is the Supersprint Turbo downpipe kit and full exhaust system, and a ECU tune.
With gains of + 50 Hp, and an average of + 80Nm in torque throughout the entire rpm range, the E89 Z4 35is exceeds the performance of the previous generation, BMW Motorsport E85/E86 Z4 M.
Ease of installation, lightweight, excellent reliability, legendary sound, albeit with no droning in the low rpm range. All of these features are included within the Supersprint exhaust package.