There are a ton of things you can add to your 328 in terms of performance to add a bit of power.

Performance:
BMS Power Box
aFe stage 2 si intake
Rogue Engineering Ikon Exhaust

We carry a ton of mods for your car and this is just a small list of what you can possibly do. Feel free to drop me a pm, email me at Alan@modbargains.com, or give me a call at 714-582-3330 x 8006 if you'd like to speak about this in more detail

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We Specialize In: BMW Parts | BMW Tuning | VMR Wheels | Cobb AccessPORT N54 | Avant Garde Wheels | BMW Headlights
Alan Wei | Alan@ModBargains.com | (714) 582-3330 ext. 8006
Hours: Monday - Friday 8:00am-7:00pm / Saturday 8:00am - 5:00pm (PST)