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Actually the exhaust might be the answer
The 325i is using a different exhaust manifold than the z4 23i, also the rest of the exhaust is different, but I imagine this is the primary reason why they have different power outputs, it has to be something related to the CO2 regulations.
Code OE: 18407599532
Exch. exhaust manifold with catalyst ZYL.1-3 EU5
Code OE: 18407586690
Exch. exhaust manifold with catalyst ZYL. 1-3
I imagine if I will swap the manifold of the 325i, I wont be able to pass the Technical Inspection due to higher CO2 Emissions. what are your thoughts?
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