Product Description
MBRP M1031 Armor Pro Muffler — 4" single inlet / 4" single outlet, 24" body length, 30" overall length, T304 stainless steel with spiral louver core for classic MBRP sound and high flow.
Fitment
- Universal — replaces any 30" overall length muffler with 4" inlet/outlet (popular on diesel pickup 4" systems).
- Dimensions: 6" body diameter (approx.), 24" body length, 30" overall length.
- Material/Series: T304 Stainless Steel — Armor Pro / Pro Series.
Features
- Spiral louver design accelerates gas flow for reduced backpressure.
- Fully welded, long-lasting core with high-density packing.
- Delivers the signature MBRP tone without excessive drone.
Cross-Reference / Alternatives (MBRP Only)
- MBRP M1004A — 4" Quiet Tone, 24" body, 30" overall, Aluminized (Armor Lite)
- MBRP M1004S — 4" Quiet Tone, 24" body, 30" overall, T409 Stainless (XP Series)
- MBRP M91031 — 4" In/Out, 24" body, 30" overall, T409 Stainless (XP Series)
- MBRP M2050 — 5" In/Out, 24" body, 31" overall, Aluminized (Armor Lite)
- MBRP MDA30 — 4" Muffler Bypass (30" overall) Aluminized (Armor Lite)
UPC
882963100733
Why Buy From CPP Diesel
- Diesel-focused fitment help and fast shipping.
- Only genuine MBRP parts with clear material/series guidance.
- Category experts — we stock alternatives and hardware to finish the job right.
Helpful Notes
- Verify available space for a 30" overall muffler and 4" pipe ends.
- We recommend new 4" clamps when installing a new muffler.
FAQ
Will this muffler fit my truck?If your exhaust uses 4" tubing and a 30" overall muffler (common on many diesel 4" systems), this universal M1031 will fit with standard 4" clamps or weld-in install.
What’s the difference between M1031 and M1004?
M1031 is a straight-through, high-flow T304 (Armor Pro) muffler. M1004 is the Quiet Tone variant offered in Aluminized (M1004A) or T409 Stainless (M1004S) with a dual-core, quieter design.
Is this true T304 stainless?
Yes. M1031 is part of MBRP’s Armor Pro/Pro Series line built from T304 stainless, ideal for maximum corrosion resistance.
What clamps do I need?
Two 4" exhaust clamps (lap-joint or band-style) are typically used — sold separately.
