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Complete waste of money to do anything performance engine related on a 320i.
Intake will do nothing for power, will just make noise
If you want to genuinely improve the performance of the car you should look at suspension modifications to make the car handle and corner better. Can easily make the steering sharper and turn in better and make it really enjoyable to drive on the mountain roads.
If cornering doesn't interest yo much and you're only interested in making the car go fast in a straight line, then you really need to just get a more powerful car like a 335i
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