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JB3 (which is now updated as a JB4) is only for BMW turbo vehicles, wether it be 135,335,535,Z435i.
328i has BMS Powerbox (Same makers as JB3/4) that remaps the throttle to give you better pedal response and adds around 10hp.
Take a look at Powerbox reviews. Either way a Powerbox 328i isn't faster than a 335i. Hope this helps
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