Product Description
Upgrade your 7.3L! The MBRP FS9401 4" Down Pipe is a direct-fit, mandrel-bent T409 stainless (Armor Plus) upgrade for 1999–2003 Ford F-250/F-350 7.3L Power Stroke trucks. Increased flow helps lower EGTs and unlocks power while the rugged 16-gauge T409 handles harsh road conditions.
- 4" diameter, smooth mandrel bends
- T409 stainless steel (Armor Plus) construction
- Lifetime manufacturer warranty on Armor Plus
- Jig-built for accurate fitment
Fitment
- 1999, 2000, 2001, 2002, 2003 Ford F-250/F-350 — 7.3L Power Stroke
- Not for vehicles equipped with a catalytic converter
Cross-Reference / Alternatives (MBRP only)
- Aluminized alternative (Armor Lite): MBRP FAL401 4" Down Pipe
- Full turbo-back (aluminized): MBRP S6200AL 4" Turbo-Back Single Side Exit
- Full turbo-back (T409 stainless): MBRP S6200409 4" Turbo-Back Single Side Exit
- Full turbo-back (T304 stainless): MBRP S6200304 4" Turbo-Back Single Side Exit
What’s Included
- (1) 4" T409 stainless down pipe
- Necessary installation hardware as supplied by MBRP
Specs
- Material: T409 Stainless (Armor Plus)
- Pipe Size: 4"
- UPC: 882963100597
Notes
- Professional installation recommended.
- Check local and state regulations regarding emissions equipment before installation.
Will this fit my 1999–2003 7.3L Super Duty?
Yes — it fits 1999–2003 Ford F-250/F-350 with the 7.3L Power Stroke. It is not intended for trucks equipped with a catalytic converter.
What’s the difference between Armor Plus and Armor Lite?
Armor Plus uses T409 stainless for superior corrosion resistance and includes a lifetime warranty. Armor Lite is aluminized steel at a lower price point. See the FAL401 alternative.
Will a 4" down pipe reduce EGTs?
Yes — the larger, mandrel-bent pipe improves exhaust flow which typically helps reduce exhaust gas temperatures under load.
Do I need tuning with this down pipe?
No tuning is required just to install the down pipe, but tuning can further optimize performance when combined with other upgrades.
