Price when new £200 - not available now but the best fitting custom sub box available for the E46 coupe. Fits flush with chassis leg/battery area. Perfect for the box volume, JL Audio 12TW1 sub. Cheapest retail £215 Morel Mono Class D Subwoofer amplifier - MPS1.550 - cheapest retail £350 new https://www.ebay.co.uk/itm/Morel-MPS-1-550-550W-Class-D-Subwoofer-Amplifier-/123031851575 Amp and sub no more than 8 months old with under 5 hours use! - only done 500 miles in total in the car which now sadly has been sold without the subwoofer set up. £500 - collected from Watford area - too heavy to ship. More details available on request.