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Look at it this way, the 35iS gives you a boost for 7 seconds, the Dinan gives you more boost, all the time and controls the other parts (water pump etc) for optimum efficiency. My 35i with Stage II is amazing, my gas mileage is about 34 mpg (imperial) on the highway at 75mph. I would never have another 35i wthout the Dinan....
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
'03 Z4 3.0i Sterling Grey (Hers)
'01 Z3 3.0i Sapphire Black, M sport package (Mine)
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