Rogue Engineering MZ4 Diablo Exhaust

Lightweight, drone-free stainless exhaust with true flow-through design and great sound

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The Rogue Engineering MZ4 Diablo Exhaust is an impressive yet simple system designed to reduce weight while increasing performance and engine sound quality. The Diablo system features optimized tubing sizes and minimized bends to maintain exhaust velocity without compromising the necessary back pressure. This is a true flow-through design, so there's nothing to slow down the exhaust gases when they speed up with higher RPMs - unlike the factory chambered design. 

The sound is deep and throaty with the full character of the S54, without any low-rpm highway drone. The dual exhaust system is constructed of 100% full T-304 mandrel bent stainless steel for consistent strength and corrosion resistance. The MZ4 Diablo requires no cutting or welding and is made to fit exactly as factory. No new gaskets or hardware are needed.


  • Weighs only 17lbs per side, 10lbs less than the factory mufflers!
  • Mil-finished pipes and muffler, mirror polished stainless steel quad 80mm angle-cut, straight cut, staggered 3mm tips
  • Fits factory valence without modifications
  • Full TIG-welded construction, no lock seams or pinch welds
  • Factory-like hangers for OEM fit (no cutting, bending, or welding required)
  • Rogue Engineering logo tastefully stamped in the body of the muffler
  • Flow-through design does not create muffler "hot spots" found on chambered mufflers
  • Will not change ground clearance
  • Will not void factory warranty
  • Will not affect emissions
  • No permanent modifications required for installation

Notice of Regulatory Non-Compliance. This exhaust system has been developed to work in conjunction with all factory emissions controls and equipment. Installation of this exhaust will not increase emissions nor cause a check-engine light or fault codes on a properly maintained vehicle. However, neither BimmerWorld nor the manufacturer can assure compliance with local or state regulations regarding sound levels or other compliance with vehicle inspection or registration. It is the responsibility of the vehicle owner to ensure his/her vehicle complies with all federal, state, county, or local regulations. Some suppliers will not ship to certain states, requiring extra delivery time. We will advise you of any delays.

BMW Fitments:

Z Series
E85 / E86 Z4 (03-08) > Z4 M
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