Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Exhaust› Exhaust Pipes, Systems and Components
MBRP
MBRP 1999-2003 Ford F-250/350 7.3L 4 Down Pipe
SKU: M006 FS9401
Moderate — 2–4 hours
Overview
It features mandrel-bent tubing and is jig manufactured for accuracy. The ARMOR Plus series construction ensures durability and is backed by a lifetime warranty. Note that this downpipe is not for use on vehicles equipped with a catalytic converter.
Show original supplier description
Part #: FS9401
Some folks are just not satisfied with the usual. They have to always be pushing the limits; refining and adjusting; until they have the truck that has no limits. We have put together some components that will take you to the next level. The fastest path from the turbo to the tip is through an MBRP down pipe. Bulking up exhaust flow.
Features:
- Jib Manufacture To Ensure Accuracy. Power Gains. Lower Exhaust Temperatures.
Armor Plus Turbocharger Down Pipe | 4 in. Diameter | Mandrel Bent | T409 Stainless Steel | 4 in. Outlet Diameter Tip
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- Lack of power when towing or climbing grades
- High exhaust gas temperatures (EGT) under load
- Turbo lag or slow spool-up
- Excessive black smoke during acceleration
- Poor fuel economy while towing
Relevant Conversations
- 7.3 Power Stroke downpipe upgrade for towing
- MBRP 4 inch downpipe FS9401 review
- 1999 F-250 7.3 downpipe installation time
- Reduce EGTs on 7.3 Power Stroke downpipe
- Best downpipe for 7.3 Power Stroke diesel
- 7.3 turbo lag fix with larger downpipe
- P0470 code and downpipe replacement 7.3
- 4 inch vs 3 inch downpipe 7.3 performance
- MBRP Armor Plus downpipe for 2000 F-350
- 1999-2003 7.3 downpipe brand comparison
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | MBRP |
| Part Number | M006 FS9401 |
About MOTORMIA
Buy with Confidence
Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return PolicyShipping
Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
View Full Shipping Policy