Product Description
MBRP R1009 is a universal 4" resonator built from T304 stainless (Armor Pro) to fine-tune tone and reduce drone without choking flow. Specs: 4" inlet/outlet, 12" body length, 18" overall, ~6" body diameter. Lifetime structural warranty. Easy to weld or clamp into any 4" section.
- T304 stainless steel construction (Armor Pro)
- 4" single inlet / single outlet
- 12" body length / 18" overall length
- ~6" diameter body
- Lifetime no-hassle structural warranty
Fitment
Universal for any 4" diesel exhaust system (Cummins, Duramax, Power Stroke, or custom). Verify at least 18" of straight section and clearance for a ~6" OD body before install. Weld-in or use quality band clamps for serviceability.
Cross-Reference / MBRP Alternatives
- MBRP R2009 — 4" Armor Lite (aluminized) resonator, 12" body / 18" OAL.
- MBRP M1004S — 4" Quiet Tone muffler, T409 stainless, 24" body / 30" OAL.
- MBRP M1004A — 4" Quiet Tone muffler, aluminized, 24" body / 30" OAL.
- MBRP M1031 — 4" Armor Pro muffler, T304 stainless, 24" body / 30" OAL.
- MBRP MDS30 — 4" Armor Pro muffler bypass pipe, 30" overall.
- MBRP GP015 — 30" high-flow 4" muffler.
Helpful Notes
Armor Pro (T304) is recommended for salted roads, coastal regions, or show builds where finish longevity matters most. For budget builds in dry climates, consider the aluminized R2009.
FAQ
Will the R1009 quiet a straight-pipe 4" system?
Yes. It reduces rasp and highway drone while maintaining a deep tone. For maximum quieting, pair with an MBRP Quiet Tone muffler like M1004S or M1004A.
Clamp or weld installation?
Either works. Weld for permanence; quality band clamps make future service and repositioning easier.
What are the exact dimensions?
4" ID inlet/outlet, 12" body length, 18" overall length, ~6" body diameter.
What warranty does it carry?
Lifetime, no-hassle structural warranty on the Armor Pro series.
