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      10-15-2011, 07:27 AM   #27
Drives: BMW Z4 sDrive35i
Join Date: Jan 2010
Location: Cote d'Azur

Posts: 65
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Originally Posted by Constant.S View Post
The engine is the same but the 35is has the following: Different internals (more durable), different gear ratios, upgraded fuel pump (the one that now BMW offers as an upgrade to all the HPFP failures), a "little" less restricted exhaust, performance cooling system and of course the different ECU with overboost function on the ECU which respectively will give more power on an tuned car (and thats something you cant retrofit).
According to, the engine and gearbox part numbers are same for both 35i and 35is. I don't understand how there could be any difference between them.
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