OP, you can start out with deleting the charcoal filter and getting a K&N or AFE drop in filter. Or if daddy gives you a big allowance you can get the Euro Intake.
You can also get an exhaust and then finish it up with a tune.
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E90 325i|Sparkling Graphite Metallic|Steptronic|Black Leatherette/Dark Burl Interior|OEM Alarm|35%Front/5%Rear Tint|RD LED License Plate Lights|Rear Fogs Activated|Debadged|Smoked Sidemarkers|Blacklines|Depo P90v2|Matte Black Grille|BMS PBX|AFE Drop In|Charcoal Filter Delete|Air Scoops| RM Silicone Intake Hose| Magnaflow 14815| 19" Avant Garde M310|Continental DWS|M3 Lip Spoiler
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