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Performance Systems Integration

PSI (Performance Systems Intergration) - Improve Electrical Efficiency

Founded to address the growing demand for precision-engineered wiring systems, PSI has become a trusted source for enthusiasts and professionals alike. The company is committed to enhancing vehicle performance and reliability through its innovative products, which are designed to simplify installation and improve electrical efficiency. PSI offers a wide range of custom wiring harnesses tailored for various engine types and configurations, including LS swaps and other performance engine setups. These harnesses are designed for easy installation and optimal performance. Shop our favorite PSI products here at CPP!

PSI Auto Trans Wiring Harness w/ 6L80E for 2008 LS2 6.0L Auto Transmission with 6L80E
2008 LS2 6.0L Auto Transmission with 6L80E
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In Stock

Part # HAR-1078

0%

$719.00
PSI Conversion LS Wiring Harness for 2009-2015 LS 58X with 6L80E or 6L90E
2009-2015 LS 58X with 6L80E or 6L90E
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In Stock

Part # HAR-1098

0%

$819.00
PSI Standalone Wiring Harness w/ 4L60E
4L60E
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In Stock

Part # HAR-1016

0%

$599.00
PSI Conversion LS Wiring Harness for 2005-2006 GM LS2 with 4L60E
2005-2006 GM LS2 with 4L60E
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In Stock

Part # HAR-1094

0%

$664.00
PSI DBC LT1/LT4 w/ T56 Standalone Wiring Harness
1994-1995 Vortec LT1 or LT4 with T56
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In Stock

Part # HAR-1006

0%

$519.00
PSI T56/TR6060 Manual Transmission Wiring Harness
T56 or TR6060 Manual Transmission
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In Stock

Part # HAR-1065

0%

$569.00
PSI Vortec DBW w/ 4L60E Standalone Wiring Harness
2003-2007 Chevy & GMC Vortec with 4L60E, DBW
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In Stock

Part # HAR-1014

0%

$579.00
PSI Auto Trans Wiring Harness w/ 6L80E for 2008-2013 LS3 6.2L Automatic Transmission with 6L80E
2008-2013 LS3 6.2L Automatic Transmission with 6L80E
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In Stock

Part # HAR-1071

0%

$719.00
PSI DBW LS2 58X w/ 4L60E Wiring Harness
2005-2007 LS2 58x with 4L60E
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In Stock

Part # HAR-1064

0%

$659.00
PSI Vortec DBW w/ 4L60E / 4L80E Standalone Wiring Harness
5-Pin (A/C)
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In Stock

Part # HAR-1084

0%

$614.00
PSI Vortec w/ 6L80E Auto Transmission Wiring Harness
2006-2013 LS7 Vortec with 6L80E Auto Transmission
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In Stock

Part # HAR-1070

0%

$719.00
PSI Vortec w/ 4L60E Standalone Wiring Harness
Vortec with 4L60E with EV6 Injectors
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In Stock

Part # HAR-1030

0%

$579.00
PSI DBW w/ T56/TR6060 Wiring Harness
2010-2013 T56/TR6060
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In Stock

Part # HAR-1067

0%

$569.00
PSI DBC Standalone Wiring Harness w/ LS3 Injectors
1999-2006 Vortec Chevy, GMC, Cadillac and Hummer Truck Engines with T56 with LS3 Injectors
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In Stock

Part # HAR-1092

0%

$549.00
PSI Vortec DBC w/ T56 Standalone Wiring Harness w/ LS3 Injectors
1999-2006 Vortec with T56 and with LS3 Injectors
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In Stock

Part # HAR-1093

0%

$549.00
PSI Gen IV Standalone Wire Harness w/ T56/TR6060
2006-2013 LS7 with T56/TR6060
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In Stock

Part # HAR-1035

0%

$569.00
PSI Vortec w/ 6L80E Auto Transmission Wiring Harness 2 Pin
2010-2013 L99 6.2L Vortec with 6L80E Auto Transmission, 2 Pin
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In Stock

Part # HAR-1079

0%

$719.00
PSI Vortec w/ T56 Standalone Wiring Harness
2003-2007 GM Vortex with T56
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In Stock

Part # HAR-1015

0%

$579.00
PSI Gen IV Wire Harness Manual Transmission w/ T56/TR6060
2005-2007 LS2 Manual Transmission with T56/TR6060
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In Stock

Part # HAR-1063

0%

$569.00
PSI Vortec T56/TR6060 Standalone Wiring Harness
2007-2008 Vortec T56/TR6060
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In Stock

Part # HAR-1039

0%

$569.00
PSI DBC T56 Standalone Wiring Harness
1999-2003 Vortec with T56
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In Stock

Part # HAR-1019

0%

$549.00
PSI LS1 Tac Module Harness
LS1
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In Stock

Part # HAR-1022

0%

$45.00
PSI Wiring Harness LH8 w/ 6L80E
2009-2014 5.3L LY5, LMG or LH8 with 6L80E
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In Stock

Part # HAR-1073

0%

$719.00
PSI LS1 Oxygen Sensor Ext. Harness 4 Wire Square Gray
4-Wire, Square, Gray, LS1
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In Stock

Part # HAR-1024

0%

$19.00
PSI Vortec w/ T56 Standalone Wiring Harness w/ LS1 Injectors
1999-2006 Vortec Chevy, GMC, Cadillac and Hummer Truck Engines with T56 with LS1 Injectors
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In Stock

Part # HAR-1091

0%

$549.00
PSI Gen IV Manual Transmission Wire Harness w/ T56/TR6060
2008-2009 Manual Transmission with T56/TR6060
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In Stock

Part # HAR-1045

0%

$569.00
PSI DBW T56 Standalone Wiring Harness
2002 Vortec T56, DBW
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In Stock

Part # HAR-1085

0%

$599.00
PSI Vortec DBW w/ 4L60E Standalone Wiring Harness w/ LS1 Injectors
1999-2006 Vortec Chevy, GMC, Cadillac and Hummer Truck Engines with 4L60E with LS1 Injectors
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In Stock

Part # HAR-1090

0%

$549.00
PSI Gen IV Auto Transmission Wiring Harness 4L60E
Auto Transmission with 4L60E
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In Stock

Part # HAR-1036

0%

$659.00
PSI Wiring Harness LH6 w/ 6L80E w/ EV6 Injectors
2005-2014 LH6 with 6L80E with EV6 Injectors
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In Stock

Part # HAR-1058

0%

$589.00
PSI Auto Trans L76 Wiring Harness w/ 6L80E
2008-2009 L76 with 6L80E
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In Stock

Part # HAR-1075

0%

$719.00
PSI 58X w/ 4L60E Wiring Harness DBW
2008 LS2 6.0L 58x with 4L60E
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In Stock

Part # HAR-1066

0%

$659.00
PSI DBC LS1 w/ 4L60E Standalone Wiring Harness
1997-2002 LS1 with 4L60E
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In Stock

Part # HAR-1012

0%

$549.00
PSI Wiring Harness LY6 w/ 6L80E
2009-2013 6.0L or 6.2L LY6 with 6L80E
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In Stock

Part # HAR-1074

0%

$719.00
PSI Gen IV Wire Harness w/ 4L60E Auto Transmission
2008-2009 L76 with 4L60E
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In Stock

Part # HAR-1046

0%

$659.00
PSI DBC LS1 w/ T56 Standalone Wiring Harness
1997-2002 LS1 with T56
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In Stock

Part # HAR-1013

0%

$549.00

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Frequently Asked Questions

How can I tell if an item is in stock?

You can check the availability of an item on the product page above the item price. If an item is in stock, in green text it will say “In Stock”. If the item is unavailable it will say “backordered” in red text. You always have the option to purchase a backordered item that we will ship to you once it becomes available. For any backordered items purchased, our team will notify when the item is now back in stock and ready to ship.

Why can't I find the part I am looking for?

Can't find what you are looking for? Some times it is just the terminology you are using. But don't worry! We are hear to assist you. You can use our Part Finder feature to search by application or you can give us a call and we can help you locate it with the part number. Also, if you don't want to deal with technology, give us a call at (714) 522-2000 and place an order with us over the phone.

What shop promotions and discounts do you offer?

We offer a variety of promotional discounts including military discounts, advertisement discounts and sales promotions. The best way to stay updated on our latest promotions is by signing up for our newsletter. You can sign up for our newsletter by entering your email at the "Be the First to Know" section on the bottom of the page or by subscribing on your account page. To learn more, please email us at info@classicperform.com.

How do I find my instruction sheet online?

There are a couple ways you can find the instruction sheet for your products. In most cases, instruction sheets can be located in the Tech Resources section on the product page. Not finding it there, you can also search for it by visiting our Tech Resource page and selecting the option for "Installation Instructions". Still not seeing it, give us a call at (714) 522-2000 or email us at info@classicperform.com and we will email it to you.

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