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Welcome to our new Site We are adding some final touches. For other T-harnesses Options please visit T-harness.com. Thank you
Welcome to our new Site We are adding some final touches. For other T-harnesses Options please visit T-harness.com. Thank you

LLJ Customs Car Audio Fabrication

0/1 Awg Wire Ferrule 22mm

LLJ Customs Car Audio Fabrication
Original price $1.00 USD - Original price $1.00 USD
Original price
$1.00 USD
$1.00 USD - $1.00 USD
Current price $1.00 USD
In stock

A Wire Ferrule is a connector used to terminate stranded wires (sometimes referred to as a cord end terminal or bootlace ferrule). Traditionally a ...

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17.5" LLJ Pair Runner

LLJ Customs Car Audio Fabrication
Original price $75.00 USD - Original price $75.00 USD
Original price
$75.00 USD
$75.00 USD - $75.00 USD
Current price $75.00 USD
In stock

Crafted from 1/4 inch aluminum, a tool made for a true artist. Our design sets the bar for versatility and durability when it comes to wire managem...

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19" LLJ ABS Pair Runner amp rack hole guide

LLJ Customs Car Audio Fabrication
Original price $20.00 USD - Original price $20.00 USD
Original price
$20.00 USD
$20.00 USD - $20.00 USD
Current price $20.00 USD
Out of stock

Crafted from 1/4 inch ABS/Acrylic, a tool made for a true artist. Our design sets the bar for versatility and durability when it comes to wire mana...

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2014-2018 GM/GMC vehicles with 8" or select 4" screen's (Without Bose) Base Connector

LLJ Customs Car Audio Fabrication
Original price $60.00 USD - Original price $60.00 USD
Original price
$60.00 USD
$60.00 USD - $60.00 USD
Current price $60.00 USD
In stock

Our 8" screen GM/GMC harness is designed to work with a variety of vehicles from a Silverado, Sierra, Suburban and any other GM vehicles that use ...

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2014-2023 LLJ General Motors pickup factory Speaker Upgrade Kit©

LLJ Customs Car Audio Fabrication
Original price $195.00 USD - Original price $195.00 USD
Original price
$195.00 USD
$195.00 USD - $195.00 USD
Current price $195.00 USD
Low stock

Fitment Guide: Chevrolet Equinox 2015-2019 (2012-2015 with Pioneer system) Impala 2014-2021 Malibu 2016-2021 Suburban 2015-2021 Silverado 2014-2...

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4 Awg Wire Ferrule 22mm

LLJ Customs Car Audio Fabrication
Original price $0.45 USD - Original price $0.45 USD
Original price
$0.45 USD
$0.45 USD - $0.45 USD
Current price $0.45 USD
In stock

A Wire Ferrule is a connector used to terminate stranded wires (sometimes referred to as a cord end terminal or bootlace ferrule). Traditionally a ...

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51608 Tesa 15mm x 25m Cable Adhesive Cloth Fabric Wiring Loom Harness Tape

LLJ Customs Car Audio Fabrication
Original price $5.20 USD
Original price $5.20 USD - Original price $5.20 USD
Original price $5.20 USD
Current price $3.25 USD
$3.25 USD - $3.25 USD
Current price $3.25 USD
Out of stock

Our 51608 Tesa tape rolls are always in stock and have the best pricing. The more you buy the better the discount.  Full Roll  Length 25 m Width ...

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8" LLJ ABS Pair Runner Amp Rack wire guide

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
Out of stock

Crafted from 1/4 inch ABS/Acrylic, a tool made for a true artist. Our design sets the bar for versatility and durability when it comes to wire mana...

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8" LLJ Pair Runner

LLJ Customs Car Audio Fabrication
Original price $40.98 USD - Original price $40.98 USD
Original price
$40.98 USD
$40.98 USD - $40.98 USD
Current price $40.98 USD
In stock

Crafted from 1/4 inch aluminum, a tool made for a true artist. Our design sets the bar for versatility and durability when it comes to wire managem...

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90° LLJ Pair Runner

LLJ Customs Car Audio Fabrication
Original price $25.98 USD - Original price $25.98 USD
Original price
$25.98 USD
$25.98 USD - $25.98 USD
Current price $25.98 USD
In stock

Crafted from 1/4 inch aluminum, a tool made for a true artist. Our design sets the bar for versatility and durability when it comes to wire manage...

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ANC bypass harness GMC vehicles W/ UQS,UQP,UQA,UQF RPO Code 2021-Up

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
In stock

This GMC Buick ANC bypass harness was designed for vehicles that have the factory Bose amplifier and an RPO code of  UQA,UQF,UQS,UQP. This chevy AN...

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Automotive Amp Rack 2019-2022 Silverado Sierra rear under seat

LLJ Customs Car Audio Fabrication
Original price $80.00 USD - Original price $80.00 USD
Original price
$80.00 USD
$80.00 USD - $80.00 USD
Current price $80.00 USD
In stock

This amp rack is mounted under the rear driver side below the rear seat. It uses the lowering jack equipment holder bolt. This custom cut amp rack ...

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Bose ANC bypass harness for 2013-2023 GM/GMC/Cadillac

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
In stock

Our Bose ANC bypass harness is the first in the world. We developed the Bose ANC bypass harness to disable the Bose ANC microphones in your vehi...

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Bose Wirenator OEM Amp Bypass with 20ft Lead - for 2013-2019

LLJ Customs Car Audio Fabrication
Original price $85.00 USD - Original price $85.00 USD
Original price
$85.00 USD
$85.00 USD - $85.00 USD
Current price $85.00 USD
Out of stock

Our GM Bose Wirenator OEM Amp bypass harness lets you keep using the factory wires already running to your speakers, with an after market amp or h...

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Bose Wirenator OEM Amp Bypass with 20ft Lead - for 2019-2025

LLJ Customs Car Audio Fabrication
Original price $85.00 USD - Original price $85.00 USD
Original price
$85.00 USD
$85.00 USD - $85.00 USD
Current price $85.00 USD
Out of stock

Our GM Bose Wirenator OEM Amp bypass harness unique design, lets you keep using the factory wires already running to your speakers, with an after ...

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Cadillac AKG T-harness 2021-2025 R2R

LLJ Customs Car Audio Fabrication
Original price $240.00 USD - Original price $240.00 USD
Original price
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

The Cadillac AKG amplifier T-harness design lets you add a subwoofer in minutes. Our plug and play Cadillac AKG T-harness is guaranteed to deliver...

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Cadillac Bose ANC bypass harness with 12+ speakers w/ RPO UQG 2021-Up

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
In stock

Cadillac Bose ANC bypass harness is a must have in any Cadillac vehicle with Bose. The Cadillac ANC bypass harness will need to be installed at the...

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Cadillac CT6 ANC bypass harness 2020-2024

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
In stock

For Cadillac CT6 ANC ANC bypass harness. The amplifier will be located in the trunk of the car. This Cadillac ANC bypass harness is keyed and will ...

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Chevy GMC subwoofer T-harness Aqua/Tan 2019-2024 (None amplified) R2R

LLJ Customs Car Audio Fabrication
Original price $240.00 USD - Original price $240.00 USD
Original price
$240.00 USD
$240.00 USD - $240.00 USD
Current price $240.00 USD
In stock

Chevy Aqua & Tan T-Harness allows you to add any aftermarket subwoofer to the Chevy/GMC/Cadillac Audio  system in minutes. Using the Chevy/...

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Chevy work/custom/elevation trim vehicles with 4" or 7" Screen Elite harness base connector

LLJ Customs Car Audio Fabrication
Original price $60.00 USD - Original price $60.00 USD
Original price
$60.00 USD
$60.00 USD - $60.00 USD
Current price $60.00 USD
Out of stock

Our 7" Chevy harness is designed to work with GM/GMC vehicles like a Traverse with a 7" screen or a Silverado with the Work Truck, Elevation or C...

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Chevy/GMC 8 inch speaker door adapter 2014-2024

LLJ Customs Car Audio Fabrication
Original price $65.00 USD - Original price $65.00 USD
Original price
$65.00 USD
$65.00 USD - $65.00 USD
Current price $65.00 USD
In stock

GM/GMC 8" inch speaker adapter is a perfect factory replacement. This will allow you to upgrade from the factory 6x9 speaker to an aftermarket sub...

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Chevy/GMC dash tweeter adapter 2014-2025

LLJ Customs Car Audio Fabrication
Original price $15.00 USD - Original price $15.00 USD
Original price
$15.00 USD
$15.00 USD - $15.00 USD
Current price $15.00 USD
Out of stock

Our GM/GMC dash tweeter adapters give you a secure surface to mount your new aftermarket tweeter. Keep everything factory and secure, with our GM/G...

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Compression lugs for 0/1 Awg wire

LLJ Customs Car Audio Fabrication
Original price $2.25 USD - Original price $2.25 USD
Original price
$2.25 USD
$2.25 USD - $2.25 USD
Current price $2.25 USD
In stock

Compression lugs are designed to terminate copper conductors. Each lug is electro-tin plated to resist corrosion. Ferrules Direct compression lugs ...

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Compression lugs for 4 Awg wire

LLJ Customs Car Audio Fabrication
Original price $2.25 USD - Original price $2.25 USD
Original price
$2.25 USD
$2.25 USD - $2.25 USD
Current price $2.25 USD
In stock

Compression lugs are designed to terminate copper conductors. Each lug is electro-tin plated to resist corrosion. Ferrules Direct compression lugs ...

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Industry leaders or thieves?

Stolen designs

For years people like CAF and 5STAR said you HAD to pull new speaker wire, then we showed up and now they say loops are the way. Don't trust people who copy others and try to take credit.

The year was 2018

Before the solutions were even needed we had them. It wasn't until 2022 that PAC Audio and Metra would have to backstep and steal our design to stay in the game.

The SCAM that is PAC Audio

The amp-pro was PACs first try to steal our ideas. It failed so bad they had to steal our ANC bypasses to make the amp-pro (2019) work better. (pic taken 2017)

12v Knowledge block

What Is "High Level" or "Low level" ?

What Is "High Level" or "Low level" ?

High level: AKA Speaker level is an amp that can handle an input voltage of 8-40v. This high output is common in factory amplified vehicles or where the
max voltage of a head unit is more than 10v. This is normally identified by a pigtail connection point or via the RCA on the amplifier (must check user manual to verify). Some amps have a switch for this. NOT all amps have this feature.

Low Level: is 0-8v of signal voltage. This is most commonly found in aftermarket head units or other aftermarket units that use can-bus. Most passive LOC units output 0-5v, so they are considered a low level and are normally RCA to RCA. Modern day ACTIVE LOC units can output 0-10v of signal.

In conclusion an LOC works as an in-line filter that lets you control the signal, its intensity and in some cases the playable frequency range.

If your amp takes a high level and it is within the vehicles factory output range then you don't need an loc unit and can wire in and out of your amp directly. In some Fords the signal can be flattened at the OBD2, further simplifying the installation.

Wavtech Units

Automotive Amp Racks

We created the Automotive Amp Rack

We created the Automotive Amp Rack

to give customers a secure place to mount their equipment without damaging their vehicles and having the ability to build and test everything outside of the vehicle. Choosing durable materials like ABS, HDPE, Acrylic and always using factory bolts was our mission.

This product has now turned into an upsell by shops and copy-cats like 5star and car audio fabrications on YouTube to be sold as some type of beauty product. Shops are using cheap materials like expanded PVC board and charging customers a premium price for doing something they should have been doing all along. Your choices are get robbed, or screw holes and water leaks.

They do not represent what our products are and we don't appreciate the theft of our products and ideas being used to steal from customers.