Bomiz BMW G90/G99 M5 Valved Exhaust System

The BOMIZ valved exhaust system for the BMW G90 and G99 M5 is engineered to unlock the character of the S68 twin-turbo V8 while preserving true daily drivability. With a focus on flow, tone, and long-term durability, this system transforms the M5 into the super sedan it was meant to be — brutal when you want it, composed when you need it.

Constructed from premium mandrel-bent T304 stainless steel, the BOMIZ system is built to handle heat, boost, and mileage without fatigue or corrosion. Strategically placed resonators and a precision-designed rear muffler work together to sharpen the exhaust note, reduce rasp, and keep in-cabin frequencies controlled — especially in Comfort mode with the valves closed.

Using OEM-style electronic valve actuators, the BOMIZ system integrates seamlessly with factory drive modes. Valves closed delivers a refined, low-drone tone suitable for long highway drives. Open the valves, and the M5 comes alive with an aggressive, motorsport-inspired bark and throttle response that rewards spirited driving.

Unlike off-the-shelf systems that compromise on material thickness, weld quality, or fitment, every BOMIZ exhaust is TIG-welded by specialists, jig-built for repeatable precision, and backed by a lifetime warranty against manufacturing defects.

Specifications

• Mandrel-Bent T304 Stainless Steel Construction
• Valved Rear Muffler for Dual Personality (Quiet/Comfort vs Open/Track)
• OEM-Style Electronic Valve Integration (Retains Factory Control Logic)
• Resonated Mid-Section for Clean, Refined Tone and Reduced Rasp
• Optimized Flow for HP and TQ Gains Across the Powerband
• Direct Bolt-On to OEM Downpipes (No Cutting or Welding Required)
• Engineered to Minimize Cabin Drone at Cruising Speeds

What’s Included

• Complete BOMIZ Valved Exhaust System (Mid-Section + Axle-Back)
• OEM-Style Mounting Points and Hangers
• All Necessary Clamps, Hardware, and Gaskets
• Valve Extension Harnesses/Adapters (Where Required for Fitment)
• Installation Instructions

(Optional add-ons such as carbon or titanium exhaust tips can be listed here if you offer them.)

Fitment

• BMW G90 M5
• BMW G99 M5 Touring

Designed for all G9x M5 variants equipped with the S68 engine and M xDrive.

Backed for Life

Every BOMIZ exhaust system is covered by a lifetime warranty against manufacturing defects. If it fails due to craftsmanship or material issues, we’ll take care of it — because a system built without compromise should be backed the same way.

Notice – Competition Use Only

This product is intended for off-road/competition use only.

WARNING: Certain aftermarket exhaust systems may not comply with applicable US (including California) laws and regulations, and may therefore be prohibited for use on highways or roads, or on vehicles subject to emissions control requirements. California prohibits the use of any aftermarket exhaust system that modifies, removes, or replaces original equipment catalysts, unless CARB has issued an Executive Order for that part or system.

BOMIZ parts or exhaust systems/components used or intended for use on “racing vehicles” (i.e., a competition vehicle used exclusively for competition on closed-course circuits) do not require an exemption or Executive Order from CARB to be sold in California. However, such parts are prohibited from use on California public highways or roads, even if occasionally used “off-road.”