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If you just have standard audio try installing the HK tweeters front and rear. It makes a massive difference, sounds are much clearer and you can turn down the treble allowing some bass through. It's no Alpine upgrade or HK but a definite step up!
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BMW 135i N54 | Black Sapphire | M-Sport | BMS 10mm Spacers (Rear) | Eibach 5mm Spacers (Front) | Gunmetal 261M 18" Wheels | Vredestein Ultrac Sessanta 225/255 | LCI Tails | COBB AP Stage 1+ | Matt Black Grilles | BMW PE + Resonator Delete | N55 Midpipe | Rieger Tuning Matt Black Diffuser | ETS FMIC
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