Diamond Eye Performance K4321S 4-Inch Turbo-Back Dual Exhaust – Ford 7.3L Powerstroke

The Diamond Eye Performance K4321S 4-Inch Turbo-Back Dual Exhaust System is designed for 2000–2003 Ford F-250 and F-350 trucks equipped with the legendary 7.3L Powerstroke diesel engine. Built from durable T409 stainless steel, this turbo-back exhaust improves exhaust flow, lowers exhaust gas temperatures, and enhances overall engine efficiency for towing, daily driving, and performance use.

This system is engineered specifically for automatic transmission trucks without a catalytic converter and features a C.A.R.B. exempt diesel downpipe, making it a compliant option for emissions-controlled regions. With a full turbo-back design and dual rear exit configuration, the K4321S delivers a deeper diesel tone, improved throttle response, and long-term corrosion resistance. This kit is designed to fit all cab and bed lengths and installs using factory mounting locations.

Key Features

• 4-inch turbo-back dual exhaust system

• Designed for 7.3L Powerstroke diesel engines

• Improves exhaust flow and reduces EGTs

• Durable T409 stainless steel construction

• Dual rear exit design

• C.A.R.B. exempt diesel downpipe included

• Direct-fit system using factory hangers

Technical Specs

• Exhaust Type: Turbo-Back Dual

• Tubing Diameter: 4-Inch

• Material: T409 Stainless Steel

• Vehicle Engine: 7.3L Powerstroke Diesel

• Transmission: Automatic only

• Catalyst Requirement: Non-catalyst models

• Emissions Compliance:

  • C.A.R.B. Exempt Diesel Downpipe

  • Executive Order #: D-778-1

• Exit Style: Dual Rear Exit

Vehicle Fitment

• 2000–2003 Ford F-250 7.3L Powerstroke Diesel

• 2000–2003 Ford F-350 7.3L Powerstroke Diesel

  • All cab lengths

  • All bed lengths

  • Automatic transmission only