DOC #CERT-DF87-457E-32DC
07.09.2026
Performance Report
ECU Chiptuning — Stage 1
Document Date
07.09.2026
BMW Z4
E85 - 2003 - 2008 30i 258HP 3934 Petrol
Original
258HP
300 Nm
Stage 1
278HP
320 Nm
+20 HP / +8% +20 Nm / +7%
Estimated Power and Torque Curve
Customer
Chassis
Date
Signature
Stamp
NOTICE: This document represents estimated values based on database information. It is not valid as official certification without the original handwritten signature and physical stamp of the authorized technician. Performance values may vary based on vehicle condition, fuel quality and operating environment.