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if thats what they say...i would just stick with the stock headers.
I dont think its really worth your time to try to get it work and risk blowing up your engine.
Headers on a supercharger do not yield as large benefits compared to a turbo charger since the supercharger is crank driven and not driven by exhaust gases like the turbo.
you would probably make more power going to a smaller super charger pulley or larger intercooler.
but at $4700, it would probably be cheaper for you to trade in your car and just buy a 335i, unless you really really love your 328i. In the used market the difference between a 328i and 335i is around $2-3k from what i seen.
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