DIAMOND EYE K4340S CAT BACK EXHAUST SYSTEM 03-07 FORD F250/F350 SUPERDUTY 6.0L 4 INCH WITH MUFFLER SPLIT REAR/SIDE STAINLESS

DIAMOND EYE K4340S is a 4.0" T409 stainless dual cat-back system engineered for the 2003.5–2007 Ford F-250/F-350 6.0L Powerstroke. It replaces the factory cat-back with mandrel-bent 4" tubing, a high-flow muffler, and a split rear/side dual exit for a deep tone and improved exhaust flow.

Designed specifically for 4x4 applications (all cab & bed lengths), this kit includes the required clamps and hardware and follows the stock-style dual exit for a clean, OE-plus look. Installation is straightforward using basic hand tools; see the official K4340S install sheet (PDF).

Note: This is a cat-back system and retains the catalytic converter.

FAQ: WILL THIS FIT MY TRUCK?

Yes, if you have a 2003.5–2007 Ford Super Duty F-250/F-350 with the 6.0L Powerstroke and 4x4. Fits all cab and bed configurations for those model years. (Verify build year 2003.5+ for correct intermediate pipe length.)

FAQ: MUFFLER VS. STRAIGHT PIPE?

This K4340S kit includes a muffler for a deep, refined tone. If you prefer a more aggressive sound, the K4340S-RP variant uses a muffler replacement pipe (no muffler).

FAQ: MATERIAL

The system is built from 409 stainless steel for corrosion resistance and longevity in harsh climates.

Fitment Details

• Vehicle: 2003.5–2007 Ford F-250/F-350 Super Duty, 6.0L Powerstroke
• Drivetrain: 4x4 only (all cab & bed lengths)
• Configuration: 4" T409 stainless, dual cat-back, split rear/side exits, includes muffler

Cross Reference & Related Items

• K4340S-RP — Same kit with muffler replacement pipe (no muffler)
• K4338S — 4" T409 stainless cat-back (single-exit) for the same platform
• K4338A — 4" aluminized cat-back (single-exit) for the same platform

Specifications