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Hm,
From what I've gathered so far, the 128i/328i have the following mods:
1. ECU Tune (AA tune or OE tune)
2. Exhaust (BMW Performance exhaust is probably your best bet)
3. Intake (stock airbox + high flow air filter such as a K&N or AFE + charcoal filter delete + perhaps a modified additional air inlet or the Euro airbox)
4. Lighter alloy wheels
5. Cat/muffler/resonator deletes (?)
The first three might get you 10-15 HP all together?
Has anyone actually successfully installed a three stage manifold onto their 128i/328i? I know quite a few have done it to their 325i + ECU tune and managed to achieve 330i HP/torque.
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