Kooks Headers O2 Sensor Extension Kit - Chrysler 5.7L / 6.1L / 6.4L HEMI 2005-2020

Long tube headers move the oxygen sensor bosses away from their factory locations, leaving the stock harness too short to reach. This Kooks Headers kit restores the connection with four extension harnesses: two 6 in front extensions and two 18 in rear extensions, all using four-pin connectors that plug straight into the factory sensors and the vehicle side connectors, so nothing has to be cut or spliced. Kooks lists it as a replacement for damaged or lost extensions, since header kits normally ship with the harnesses they require. Made in the USA and backed by Kooks' limited lifetime warranty to the original purchaser.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy