MBRP MDS9531 UNIVERSAL MUFFLER BYPASS 5" INLET/OUTLET PIPE ARMOR PLUS SERIES

Upgrade to MBRP Armor Plus (T409 Stainless): The MBRP MDS9531 Universal Muffler Bypass replaces a 5" in/out muffler with a straight-through 31" section to reduce backpressure and sharpen exhaust tone. Built from rugged 16-gauge T409 stainless for long service life.

• 5" inlet / 5" outlet
• 31" overall length
• T409 stainless (Armor Plus / XP Series)
• Universal use (see Fitment & exclusions)
• Lifetime warranty on T409 stainless construction

Fitment

Universal 5" exhaust systems. Designed to replace a 5" muffler that is ~31" overall.
Exclusions (per MBRP/CPP listing): Not for 6.4L Ford, Chevy LMM, or 6.6L Dodge applications.

Cross-Reference / Alternatives (MBRP Only)

• Aluminized 5" version (Installer/Armor Lite): MBRP MDA531
• 4" T409 stainless bypass (30" OAL): MBRP MDS930
• 4" T409 stainless dual bypass: MBRP MDDS927
• 5" universal MBRP muffler (if keeping a muffler): MBRP M2050
• 4" aluminized delete (general reference): MBRP GP016

Helpful Notes

• Measure your existing muffler’s overall length and pipe size before ordering.
• T409 stainless may show surface discoloration in harsh climates; performance and structural integrity are maintained.

FAQ

If your system uses 5" in/out with ~31" overall muffler length, this bypass is designed to replace it. Check the exclusions listed above.

MDS9531 is T409 stainless (Armor Plus / XP) with a lifetime warranty on material/workmanship. MDA531 is aluminized steel (Installer / Armor Lite) with a 3-year warranty.

Yes. Replacing the muffler with a straight section increases volume and gives a more aggressive exhaust note.

Most 5" systems can reuse existing clamps. If your setup differs, you may need appropriate 5" band clamps or adapters.

No tuning is typically required for a muffler bypass swap in a diesel cat-back/downpipe-back system.