Kooks 1131H020 1-5/8" SS Long-Tube Headers + 2.5" X-Pipe Kit for 2005,

Vehicle Fitment

• 2005-2010 Ford Mustang GT (4.6L 3V V8, coupe or convertible; manual or automatic) - fits standard exhaust layout

Features

• Long-tube header design with 1.625" primary tubes for improved exhaust flow
• 304 stainless-steel construction - mandrel-bent for smooth flow and durability
• Includes 2.5" OEM-style catted X-pipe for optimized scavenging and exhaust balance
• Laser-cut 3/8" thick flanges for precise fitment
• Comes with all required installation hardware, gaskets, and O2 sensor extensions
• Designed to deliver increased horsepower and torque, along with an aggressive exhaust note
• Race-proven design - handcrafted in the USA by an established performance-exhaust manufacturer
• Backed by the manufacturer's limited lifetime warranty against defects

Specifications

• Primary tube diameter: 1.625 in (1-5/8") stainless steel
• Collector / X-pipe outlet: 2.5 in stainless steel
• Material: 304 stainless steel, 18 gauge tubing
• Includes: Pair of long-tube headers + 2.5" catted X-pipe + hardware/gaskets
• Compatibility: Fits 2005-2010 Mustang GT 4.6 L 3V V8 (non-Supercharged, standard exhaust routing)
• Intended use: Off-road / performance use (non-CARB states) - not CARB-compliant

Included Components

• 1x Left long-tube header
• 1x Right long-tube header
• 1x 2.5" OEM-style catted X-pipe
• Full set of installation hardware (flange bolts, gaskets, O2 sensor extenders)

Product Description

The Kooks 1131H020 header and X-pipe kit is a premium performance upgrade for 2005-2010 Ford Mustang GT owners seeking increased power, freer exhaust flow, and a more aggressive exhaust sound. The long-tube stainless-steel headers improve flow efficiency and reduce backpressure, while the 2.5" catted X-pipe balances exhaust pulses and helps extract maximum power gains. Mandrel-bent 1.625" primaries and high-quality 304 stainless construction ensure durability and long-term reliability even under hard use.

Installation uses the stock exhaust mounting points, and the kit includes all necessary gaskets, hardware, and O2-sensor extensions for a complete bolt-on setup. Once installed (and with proper tuning), it delivers noticeable gains in both torque and horsepower, along with a loud, performance-oriented exhaust note - ideal for street, track, or weekend driving applications. Because this is a high-flow design, it's recommended for off-road or non-EPA-regulated use; check local emissions laws before use.

This kit is best suited for Mustang GT 4.6L 3V owners ready to upgrade their exhaust for performance and sound. It's not compatible with forced-induction setups out-of-the-box, and tuning is highly recommended after installation to ensure optimal performance and reliability.