DIAMOND EYE K4321S TURBO BACK EXHAUST 00-03.5 F250/F350 4 INCH SINGLE IN/OUT SPLIT REAR/SIDE W/ MUFFLER STAINLESS

DIAMOND EYE K4321S is a 4.0" T409 stainless turbo-back system for 2000–2003.5 Ford F-250/F-350 7.3L Power Stroke (all cab/bed). It’s configured as single in / single out with hardware to route a split rear or split side exit and includes a performance muffler. Mandrel-bent tubing, OE-style hangers, and a direct-fit downpipe are designed for long service life and easy install. Made in the USA.

FAQ: WILL THIS FIT MY TRUCK?

Yes—if you have a 2000–2003.5 Ford F-250/F-350 7.3L with automatic transmission and a non-catalyst (49-state/early-build) configuration. Fits all cab and bed lengths. Always confirm model year/Build date (’03.5 cutoff) before purchase.

FAQ: WHAT’S INCLUDED?

Downpipe, intermediate pipes, muffler, Y/transition for split rear/side exit, tailpipes, clamps & hangers. (See parts callouts in the official instruction sheet.)

FAQ: MATERIAL & SOUND

T409 stainless resists corrosion and heat cycling. With the included muffler, tone is deep without excessive drone; a muffler-delete version is available separately (see cross-references).

Fitment Details

• Platform: 2000–2003.5 Ford Super Duty F-250/F-350, 7.3L Power Stroke
• Drivetrain: Automatic transmission only
• Emissions Config: Non-catalyst models
• Exit Options: Split rear or split side (hardware included)
• Notes: Verify build date for 2003 (early 2003.5 applicability)

Cross-Reference Items

• K4321S-RP — Same kit without muffler (muffler-delete)
• K4319S — Related 4" T409 stainless turbo-back (single-exit variant)
• K4319A — Aluminized steel counterpart (budget option)
• Clamp Kit: K4321S-5 (replacement clamp/hanger pack)

Specifications