Upgrade the Power and Ground Cable under your hood with the Big Three Upgrade. These kits have everything you need to do a Big Three Upgrade.
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Expert Advice Toll-Free
1-877-289-7664
The Sonic Advantage
WHAT GIVES SONIC THE EDGE OVER THE COMPETITION
FAST & FREE SHIPPING
We offer free shipping on thousands of popular items for our Continental US customers and discounted rates for international customers. With multiple warehouses across the US, most orders are delivered within 3 days! Learn More
LOW PRICE GUARANTEE
We pride ourselves on offering the best products at the lowest prices. If you find an identical item on another website with a lower price, we will discount our price by 105% of the difference. Some restrictions apply. Learn More
30-DAY MONEY BACK GUARANTEE
Have a problem with your order and need to return an item. Our generous 30-day return policy allows you to return items for your money back. Should your product have a defect, we will exchange, issue store credit, or repair the product for the entire length of the warranty. Learn More
FREE LIFETIME TECH SUPPORT
Our knowledgeable staff of industry professionals and certified installers is ready to help you to pick the right products for your needs. We will help you with the setup, installation, and use of your new products. Learn More
Over 1.3 million orders shipped since 2003