Filter Filters Wire Reducer 4 Gauge Remove All Filters Price Under $50 (1) Condition New (1) Brand Harmony Audio (1) Harmony Audio HA-WC4 Car Stereo Power or Ground 4 Gauge Wire Splice Coupler -... $5.95 Sound Quest by Stinger SQGA48 4Ga to 8Ga Terminal Adapter 5/16" Mounting Hole $6.95