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Want to Improve Sound Quality Simply and Effectively? Replace Your BMW's Speakers!
Our Stage 1 Audio Upgrades are the perfect speaker upgrade solution. Designed as a 100% complete, plug and play BMW speaker upgrade kit, they provide a simple, easy way to replace your speakers and dramatically improve sound quality without having to change any other components in your BMW -- because our Stage 1 Audio Upgrades are engineered specifically for your exact BMW.

BSW Stage I Audio Upgrade for BMW Z3 / MZ3 Roadster, Coupe 96-02

BSW Stage I Audio Upgrade for BMW Z3 / MZ3 Roadster, Coupe 96-02
Delivers striking clarity and definition, more musical detail, and improved bass dynamics simply and affordably by replacing your speakers.
$259.99 \| Learn More

BSW Stage I Audio Upgrade for BMW Z4 Roadster / Coupe 03-08 (E85/E86)

BSW Stage I Audio Upgrade for BMW Z4 Roadster / Coupe 03-08 (E85/E86)
Replace your factory BMW speakers with this simple, easy to install, direct-swap kit for an incredible improvement in sound quality and performance.
$399.99 \| Learn More