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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!

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  1. 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
  2. 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
  3. 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
  4. PSI DBC T56 Standalone Wiring Harness

    1999-2003 Vortec with T56

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    In Stock
    Part # HAR-1019
    0%
    $549.00
  5. 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
  6. 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
  7. 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
  8. Holley Installation Kit for GM Gen V LT Accessory Drive

    Installation Kit for GM Gen V LT Accessory Drive - Allows use of High Mount LS Accessory Drive Systems on LT engine. Requires the use of an LS water pump and LT truck damper spacing.

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    In Stock
    Part # 21-5
    0%
    $236.00
  9. 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
  10. 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
  11. PSI Vortec LY6/L92 Standalone Wiring Harness

    2007-2008 Vortec LY6/L92

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    In Stock
    Part # HAR-1040
    0%
    $659.00
  12. 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
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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.
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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.
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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.
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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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