Holley Terminator Stealth 2x4 Main Harness, Single-to-Dual Conversion Kit | 558-121

• Free shipping on orders over $99 (excludes freight shipments).
• In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
• Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
• Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
• No P.O. Boxes. International orders need a shipping quote, so email us first.

Read the full Shipping Policy

• 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
• Items must be unused, complete and in the original packaging.
• A 20% restocking fee applies, and return shipping is paid by the buyer.
• Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
• Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

Read the full Return Policy

All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

For any questions or concerns, please contact us — we’re always happy to help.