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Add-A-Battery Kits

Battery Cable

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Big Three / Big 3 Kits

Car Audio Products

Charging System Upgrade Kits

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REAL Amp Kits


Turn-On Relay Kits

Vehicle Grounding Kits

Wiring Books

Big 3 Upgrade Kits

Product Improvement - All Kits Now Include Translucent Black Ground Cables!

Click on any of the pictures to view a high resolution version.

The most popular car audio upgrade in the world - the Big 3! We've been doing this LONG before it even had a name (think 1990 or so), so it only made sense that we'd build and offer the best kit money can buy!

CLICK to read our white paper on the Big 3 Upgrade so you can learn the real benefit and understand exactly why we do it the way we do it.

Our Big 3 Upgrade Kits address the following:

  • Upgrade the charge lead from the alternator output stud to the battery
  • Upgrade the return path between the alternator and vehicle ground
  • Upgrade the return path between the battery negative (-) and the vehicle ground
  • Provide a low resistance return path for high current amplifiers

We offer Big 3 Upgrade Kits for Top Post Batteries and Side Post Batteries. If you own a vehicle with a rear mounted battery, we can custom build a kit to suit you.


"Outstanding. Parts were incredibly well constructed and you clearly did your homework. My grizzled old mechanic was very impressed and that takes some doing. The car overall now is just running better as well. This wasn't just an audio fix, it was an electrical system fix. Thanks for making such a great product."

Ryan F - Greenfield, WI

"All top notch and worth
every penny. You will not
be disappointed."

David B - Orlando, FL

Click on any of the below to view our selection:

Big 3 Upgrade Kit / Big Three Upgrade Kit for Top Post Batteries
Big 3 Upgrade Kit / Big Three Upgrade Kit for Side Post Batteries
Custom Big 3 Kits