Dinan Valved Axle-Back Exhaust with Black Tips for G42 BMW M240i and M240i xDrive
Dinan’s Valved Axle-Back Exhaust for the G42 BMW M240i and M240i xDrive adds a second electronic valve alongside the factory actuator, giving the system full control over sound instead of leaving it to the one stock valve alone. Larger 76mm piping and dual 76mm valves, thirty percent less restrictive than the factory units, feed four double-walled, straight-cut 102mm tips finished in black ceramic coating, so the exhaust can stay closed and civil in town or open up for a deeper, straight-pipe-style tone on demand. Dinan builds these systems in 100% 304 stainless steel and has engineered BMW performance parts since 1979, backing the upgrade with the same warranty philosophy it has used since partnering with BMW of North America in 1996.
Design and Performance
With both valves closed, exhaust gases are forced through the muffler for a quiet, civil cruise; open them and gas flows freely through the entire system for a deeper, meatier tone with real drone abatement built in for the highway. Dinan pairs that valve control with a genuine dyno gain and a lighter system than stock, so the M240i and M240i xDrive pick up sound and response without adding weight.
Features
- 100% 304 stainless steel construction, TIG welded, brushed finish
- Dual 76mm electronic exhaust valves, 30% less restrictive than the factory valve
- Four double-walled, straight-cut 102mm tips, 4-inch clamp-on, finished in black ceramic coating with a laser-engraved Dinan logo
- Larger 76mm mid-pipe (up from the stock 70mm)
- Level-1 install difficulty
- Emissions Code 5 rated; street legal in all 50 states
Specifications
- Piping Diameter: 76mm (stock: 70mm)
- Valve Diameter: 76mm dual electronic valves (30% less restrictive than stock)
- Tip Size: 102mm, quad configuration, double-walled
- Weight Savings: approximately 4 lbs lighter than the stock system
- Peak Horsepower Gain: +6 hp @ 6,600 rpm
- Peak Torque Gain: +5 lb-ft @ 6,600 rpm
- Installation Time: approximately 2.5 labor hours
Applications
- BMW M240i: G42 | 2023-2026 | 3.0L Turbo I6 B58
- BMW M240i xDrive: G42 | 2023-2026 | 3.0L Turbo I6 B58
Notes
- A polished-tip version is available as Dinan part number D660-0098
- Adds a dedicated second exhaust valve alongside the factory actuator for independent sound control
- Rated Emissions Code 5 and legal for street use in all 50 states
- Uses factory-style mounting hardware for a direct, no-fabrication install
Frequently Asked Questions
- Does this exhaust fit both the BMW M240i and M240i xDrive? Yes. It’s built for the G42 BMW M240i and M240i xDrive from the 2022 through 2026 model years. Dinan includes factory-style mounting hardware and clamps for a direct installation with no fabrication required on either drivetrain.
- How does the dual-valve design on the Dinan axle-back exhaust work? The system adds a second electronic valve alongside the factory actuator. With both valves closed, exhaust gases route through the muffler for a quiet, civil cruise; opening them lets gas flow freely through the entire system for a deeper, more aggressive tone on demand.
- How difficult is the Dinan Valved Axle-Back Exhaust to install? Dinan rates the job at about 2.5 labor hours using factory-style mounting hardware and clamps, with no cutting, welding, or fabrication required.
- What is the Dinan Valved Axle-Back Exhaust made from? It’s built from 100% 304 stainless steel with TIG-welded construction and a brushed finish, paired with dual 76mm electronic valves that are 30% less restrictive than the factory units and four double-walled, straight-cut 102mm tips in black ceramic coating.
- How much horsepower does the Dinan axle-back exhaust add? Dinan measured a peak gain of 6 horsepower and 5 lb-ft of torque at 6,600 rpm on the dyno, with larger 76mm piping and dual valves that flow more freely than the factory system while running about 4 pounds lighter overall.
- Is the Dinan Valved Axle-Back Exhaust street legal? Yes. It carries an Emissions Code 5 rating, meaning it’s legal for street use in all 50 states, since the factory catalytic converters and emissions equipment stay in place; only the sound and flow downstream of them change.
About Dinan
Founded in 1979, Dinan is North America’s leading BMW tuner, developing, manufacturing, and marketing a full line of high-performance products for BMW, MINI, and Mercedes-Benz. Dinan works through a nationwide network of Authorized Dinan Performance Centers, including select BMW dealerships and independent BMW service and performance shops. The company’s warranty program, introduced in 1996 with BMW of North America’s cooperation, matches BMW’s new car warranty and covers Dinan enhancements and the vehicle itself for up to 4 years or 50,000 miles. That coverage lets BMW owners add real performance without risking their factory warranty. Automotive publications have tested Dinan-enhanced BMWs against some of the world’s most exotic sports cars for three decades, and the results consistently hold up. Despite that performance, Dinan BMWs keep the reliability and everyday civility BMW owners expect. The product line spans engine, driveline, and chassis components across the full BMW lineup, covering acceleration, cornering, and stopping power. Every Authorized Dinan Performance Center can help build anything from a single upgrade to a complete Dinan BMW.
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