MBRP S6218409 | 4" Turbo Back Exhaust 409SS for 1994-1997 7.3 OBS Powerstroke

Transform your 1994-1997 Ford F-250 or F-350 7.3L Powerstroke with the MBRP S6218409 4-Inch Turbo Back Exhaust System. Built in MBRP’s rugged Armor Plus series from premium T409 stainless steel, this complete turbo-back system delivers smoother exhaust flow, a deep resonant tone, and lasting durability that OBS owners demand.

The factory exhaust on these classic OBS trucks is restrictive. By replacing everything from the turbo outlet back with smooth, mandrel-bent 4" tubing, you reduce backpressure and let your legendary 7.3L breathe. The result is quicker turbo spool, sharper throttle response, lower exhaust gas temperatures (EGTs), and more efficient power delivery — especially noticeable when towing or hauling.

KEY FEATURES & BENEFITS

• T409 Stainless Steel Construction — Corrosion-resistant and built to handle harsh conditions, road salt, and heavy use. Backed by MBRP’s Lifetime Warranty.
• Full 4" Mandrel-Bent Tubing — Maintains consistent diameter through every bend for maximum flow and minimum turbulence.
• Single Side Exit with 5" Polished Tip — Clean, aggressive stance and a rich, mellow exhaust note that sounds powerful without being overly loud.
• Retains Factory Catalytic Converter — Designed as an off-road system that keeps your emissions equipment intact (Not legal for sale or use in California).
• 3" Aluminized Turbo Downpipe — Included for a true turbo-back setup with excellent fitment.
• Complete Bolt-On Kit — Includes mid pipe, extension pipe, high-flow muffler, tailpipe, all clamps, hangers, and the mirror-polished 5" stainless tip.

PERFORMANC YOU CAN FEEL

Expect improved exhaust scavenging, reduced EGTs under load, and better overall drivability. Many 7.3 OBS owners report noticeably sharper throttle response and a more enjoyable driving experience, especially when paired with tuning or other performance upgrades. While exact gains vary, MBRP systems of this design typically deliver strong improvements in flow and reduced backpressure.

Note: Some trimming or minor fitting may be required depending on lift kit, cab/bed configuration, or other modifications. Automatic transmission models (manual transmission applications may require modificaitons).

SPECIFICATIONS

• Part Number: S6218409
• Series: Armor Plus / XP Series
• Material: T409 Stainless Steel (main tubing) with aluminized 3" downpipe
• Diameter: 4" mandrel-bent tubing
• Exit Style: Single side exit with 5" OD mirror-polished stainless tip
• Muffler: High-flow straight-through design
• Warranty: Lifetime (limited)
• Emissions: Retains factory catalytic converter • Not legal in California

Perfect for daily drivers, work trucks, towing/hauling enthusiasts, and OBS Powerstroke owners who want reliable performance and great sound without sacrificing street manners.