If you're looking to maximize sound in your Polaris Slingshot, you may consider adding one of these Fiberglass Passenger Side Under Dash 6.5" Subwoofer Enclosures by Underground Auto. Up until now, the only way to add sub woofers to your Slingshot was by utilizing your rear storage compartments. This hand laid fiberglass sub enclosure allows you to mount two 6.5" subwoofers underneath your dash to give you the bass your stereo system deserves without compromising your storage compartments. These UnderGround speaker pods come standard with a black textured finish. These pods bolt directly into place and do not interfere with your factory glove box.
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More information about this product can be found here: Polaris Slingshot Passenger Side Dual 6.5" Under Dash Fiberglass Subwoofer Enclosure