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You obviously weren't happy with the stock power, so you probably won't be happy with a manifold swap either. My advice, you're putting money into the wrong car. A 135i really doesn't cost any more to buy initially, and the maintenance difficulties / costs / reliability are extremely similar if you get a N55. They make more power and torque stock than a 128i ever will without spending gobs of money and turning the engine into a ticking time bomb, and are only a tune away from way MORE power. Both cars are on the same chassis and weight and balance is nearly the same.
I do NOT understand why people get a 128i if they're concerned in the slightest about power and performance, when the 135i exists. The ONLY valid reason, other than your parents having bought the car and you being stuck with it, would be class restrictions if you're trying to race it or something.
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