Ignitions and Electrical› Wiring Harnesses

XS Power

Kit 1/0 AWG 350A

$79.99

SKU: BIG3XS

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The XS Power BIG3XS Kit is a Big 3 upgrade kit designed for automotive charging systems. It features 1/0 AWG OFC (Oxygen-Free Copper) cables and is rated for 350A. The kit includes 6ft of 1/0 XS FLEX BL Cable and two 4ft 1/0 XS FLEX CLR Ground Cables. It also comes with heat shrink, crimp terminals, wire clamps, zip ties, and screws for installation.
Show original supplier description
The XS Power BIG3XS Kit provides a comprehensive solution for upgrading your vehicle's charging system, often referred to as the "Big 3" upgrade. This kit utilizes 1/0 AWG OFC (Oxygen-Free Copper) XS FLEX cables, capable of handling up to 350A, ensuring efficient power transfer. The package includes essential components for a robust electrical system enhancement: one 6ft 1/0 XS FLEX BL Cable, two 4ft 1/0 XS FLEX CLR Ground Cables, eight XS Power Brand Heat Shrinks, eight 1/0 Crimp Terminals, ten Wire Clamps, ten Zip Ties, and ten Screws. By replacing or augmenting the factory wiring, it helps ensure that your electrical system can handle increased demands, such as those from high-output audio systems or other aftermarket electronics. The OFC construction minimizes resistance, maximizing the effectiveness of the upgrade. Installation instructions are available for download. **Note:** This product contains chemicals, including lead and lead compounds, known to the State of California to cause cancer or reproductive harm. Please wash hands after handling and refer to www.P65Warnings.ca.gov for more information.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandXS Power
Part NumberBIG3XS
CategoryIgnitions and Electrical

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

View Full Shipping Policy