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Having owned several NA and turbo cars in the past and modified ALL of them to improve power output I have to say I would be dissapointed at the outlay for a minimal increase in power on NA car like a 30i. It just isnt worth it unless you do it for the sound or enjoyment of it.
With my current 135i a cheap mod can yield massive gains quickly and without any fuss. If I own another NA car the most I would do would be a filter and exhaust just for the sound.
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