ILL Customz offers premium, American-made products custom engineered to elevate your car audio experience to the next level. Calvin, founder of ILL Customz Metalworks is a basshead and car audio enthusiast. He believes in putting the customer first, always. From Ill Customz’s high-quality products and competitive prices to our community-inspired designs and meme-packed newsletter, we never cut corners in delivering a top-notch experience to our loyal fans.
WHAT ILL CUSTOMZ CUSTOMERS ARE SAYING
“Ordered my first product and ordered more as soon as they came in. Amazing quality at a great price. Not to mention the best service and fastest shipping” – David Pinney
“EXCELLENT quality and prices here! I was very happy when I measured the tolerances these guys observe with each product. Consistency matters to me greatly when it comes to my personal install. These are precise down to the millimeter every time. I simply refuse to purchase machined parts from anyone else. I love these guys!” – Stan Lee
-
Add to cartQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz Dual 1/0 to Single 1/0 Inputs
$19.95-
Add to cartQuick View -
Out of stockRead moreQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz 1/0ga to 4ga Reducers
$16.95-
Read moreQuick View -
Add to cartQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz Single 1/0 to 1/0 Inputs
$17.95-
Add to cartQuick View -
Out of stockRead moreQuick View
-
Out of stockRead moreQuick View
-
Add to cartQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz Dual 8ga to 8ga Speaker Inputs
$17.95-
Add to cartQuick View -
Add to cartQuick View
-
Add to cartQuick ViewBattery Terminals, Ill Customz
ILL Customz Bolt Down 4 Lug Battery Terminals
$25.95-
Add to cartQuick View -
Add to cartQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz Single 4ga to 4ga Inputs
$14.95-
Add to cartQuick View -
Out of stockRead moreQuick View
-
Add to cartQuick ViewBattery Terminals, Ill Customz
ILL Customz SAE 4 0ga Input Battery Terminals
$39.95-
Add to cartQuick View -
Out of stockRead moreQuick View
-
Add to cartQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz 4ga to 8ga Reducers
$14.95-
Add to cartQuick View -
Out of stockRead moreQuick ViewBattery Terminals, Ill Customz
ILL Customz Bolt Down 6 Lug Battery Terminals
$29.95-
Read moreQuick View -
Add to cartQuick View
-
Add to cartQuick ViewBattery Terminals, Ill Customz
ILL Customz Bolt Down 4 0ga Input Battery Terminals
$33.95-
Add to cartQuick View -
Out of stockRead moreQuick ViewBattery Terminals, Ill Customz
ILL Customz Bolt Down 8 Lug Battery Terminals
$34.95-
Read moreQuick View -
Add to cartQuick View
-
Add to cartQuick ViewAmp Inputs/Gauge Reducers, Ill Customz
ILL Customz Dual 1/0 to Single 4ga Inputs
$25.95-
Add to cartQuick View