BMW (E85) Z4 Supercharger System - ('03-'05)Overview BMW E85 Z4 2003>2005 BMW Z4 2. 5i 2003 2005 Engine: M54 ECU: MS45 Stock: 184HP 175TQ Supercharged: 285HP 231TQ (Not compatible with N52 engines) BMW Z4 3. 0i 2002 2005 Engine: M54 ECU: MS45 Stock: 225HP 214TQ Supercharged: 330HP 275TQ (Not compatible with N52 engines) VF Engineering chose to supercharge the BMW Z4 to improve throttle response and mid to top end power with the centrifugal Vortech supercharger. Maintaining the the original BMW
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