BMW Exhaust Parts, Mufflers & Catalytic Converters for BMW G42 M240i xDrive B58 3.0L

Introducing our Turner Performance Cat-Back Exhaust for your G42 M240! Precision-crafted exhaust that elevates your driving experience with a new level of excitement. Designed with our commitment to performance and quality, this exhaust is meticulously engineered to unleash the true potential of your M240. In tandem with performance and sound, our cat-back exhaust enhances the visual aesthetic with upgraded quad exit exhaust tips that complement the overall motorsport nature of the M240 and replace the fake factory exhaust tips. Upgrade your driving experience with our cat-back exhaust for your M240! Unleash the power, bask in the glorious sound, and turn heads wherever you go.

Using our signature design principles this exhaust is crafted to deliver a deep, authoritative tone that reveals the true rowdy attitude of the M240. Designed to utilize the factory valve control our cat-back provides an exhilarating sound during acceleration without compromising the daily driving amenities. Our exhaust is manufactured of 1.25mm wall T304 stainless steel for superior durability, corrosion resistance, and aesthetics. Designed with the customer in mind it features a straightforward bolt-on installation utilizing factory slip joints and mounting locations and includes are clamps and hardware necessary for installation.

Upgrading the sound:

Our exhaust allows you to turn up the volume and let the B58TU boast its smooth and hearty exhaust tone. Let's be honest, what's the point of owning a B58 if you're not going to upgrade the exhaust? Our signature muffler design allows you to transfer the exhaust valve from your factory system directly onto your new Turner system. The Turner exhaust signature muffler design allows for two flow paths that change both tone and volume. With the vehicle in eco or comfort mode, the valves remain closed, with the closed valves the exhaust system allows the gasses to flow through the muffler toning down the volume and giving a more refined exhaust note. While in driving modes sport or sport+ the valve opens and the flow path changes to a "straight flow path" essentially turning into a straight-piped exhaust for the least amount of restriction and the most amount of B58 sound!

Upgraded aesthetics:

From the factory, the G chassis comes equipped with fake or imitation exhaust tips, our Turner exhaust allows you to remove the imitation tips from the vehicle and sport a set of 4 true exhaust tips giving that upgraded motorsport styling.

How the cat-back is designed:

To create a cat-back exhaust for this incredible vehicle the upgrade happens right at the downpipe. We replaced the factory components with our full 3.0" T304 stainless steel piping. The true 3.0" exhaust makes its way through the center and rear of the car without the center muffler or resonator to keep the flow to a maximum! With smooth mandrel bent transitions our exhaust passes perfectly under the rear subframe for a factory equivalent fit. Positioned in the rear of the car is our signature B58 muffler with beautiful inlet and outlet piping that creates the perfect exhaust tuning. Featuring relief cut slip joints and fabricated sheet metal brackets the exhaust can be fully adjusted and mounted seamlessly in the factory locations. Quad 3.5" exhaust tips are optioned to fill out the open space in the rear diffuser and complete the rear profile of the vehicle.

Features and Benefits:

Street/Motorsport inspiration
Controlled by factory valves
Compatible with factory and aftermarket downpipes (80mm)
Quad exit with true exhaust tips to replace factory facia
18 lb weight savings (Factory - 63lbs, Turner 45lbs)
Part Design:

Turner In-house designed and engineered using FARO ARM laser scanning technology and SolidWorks 3D CAD modeling for precision fitment.
T304 Stainless Material in a natural finish - 1.25mm wall thickness, back purged and TIG-welded throughout
Full 3.0" Stainless Steel Mandrel Bent Tubing
T304 Stainless Steel 12mm barbed exhaust hangers Tig-Welded in OE locations for precise fitment.​
Strategically placed slip joints provide the most adjustability to obtain perfect fitment
Kit Contents:

3.0" front exhaust section (80mm flange to connect to factory and aftermarket downpipes)
Full 3.0" lightweight free-flowing midsection for better sound, performance, and weight savings.
Valved Rear muffler
Valve extension harness
Clamps and Hardware for an OEM+ install
Optional 3.5" Exhaust Tips
Product Development:

Our G Chassis B58 Valved Catback was designed, engineered, tested, and quality inspected by our Research and Development team at Turner. Nothing but the highest level of precision and quality through leading-edge product development technology including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

G42 M240 Performance Valved Cat-Back Exhaust

Unleash the true potential of your M240 with Turner Motorsport’s precision-engineered Cat-Back Exhaust, designed specifically for the B58 engine. From sound and style to pure performance, this exhaust system transforms your driving experience with an exhilarating soundtrack and unmistakable visual flair.

Engineered for performance, this exhaust system replaces the M240’s stock faux exhaust tips with striking quad 3.5" real tips. Made from premium 1.25mm T304 stainless steel, this cat-back exhaust offers superior durability, corrosion resistance, and a sleek look. Integrated valve control lets you adjust the exhaust tone to suit your driving mode, creating a refined, balanced note in comfort mode and an aggressive roar in sport mode. Turner’s unique muffler design maximizes flow when the valve is open, delivering pure, unrestrained sound and performance on demand.

Key Exhaust Features:

Authentic Quad Tips: Upgrade from the stock imitation tips to real, polished quad tips that bring motorsport aesthetics to your M240. Valve-Controlled Sound: The factory valve control allows for sound customization—subtle in comfort mode, powerful in sport mode. Durable Construction: Built from high-grade T304 stainless steel for maximum durability and resistance to the elements. Optimized Flow Design: True 3.0" piping from the downpipe to the muffler, designed without a resonator to keep exhaust flow unrestricted. Performance You Can Feel

Every aspect of the Turner cat-back exhaust is built with the driver in mind. The mandrel-bent, stainless steel piping ensures smooth airflow, while the strategically placed slip joints provide the perfect alignment and adjustability for a seamless, factory-like fit. The result? An unmistakable exhaust note and a substantial power boost.

What’s Included:

3.0" front exhaust section compatible with factory or aftermarket downpipes Lightweight, free-flowing midsection for maximum sound and performance gains Valved rear muffler for adjustable sound profiles Quad 3.5" optional exhaust tips for an aggressive rear profile Valve extension harness and all clamps/hardware for easy, bolt-on installation G42 M240i Aluminum Skid Plate

BMW’s newer high-powered engines, like the B58 and S58, require efficient cooling—but space constraints mean the oil cooler sits dangerously low and exposed. Protect this crucial component with Turner Motorsport’s heavy-duty skid plate. Constructed from 3/16" thick 5052 aluminum, this skid plate shields your oil cooler from debris and road impacts that could lead to severe engine damage. Unlike the factory plastic belly pan, Turner’s skid plate offers unmatched protection without compromising weight, aerodynamics, or cooling efficiency.

Designed to deflect debris while preserving airflow, this skid plate includes flared air channels to maintain cooling performance. It installs easily with factory hardware—no drilling or modification needed—and features a sleek black powder coat finish that’s both durable and stylish.

Skid Plate Benefits:

Enhanced Protection: Protects against rocks, debris, and other hazards that could damage your oil cooler. Factory-Compatible Installation: Bolts directly onto your car with no modification needed. Aerodynamic Design: Preserves factory aerodynamics with cooling vents for optimal airflow to the oil cooler. Durable Construction: Made from 5052 aluminum with a black powder-coated finish for superior strength and longevity. Equip your M240 with Turner Motorsport’s Cat-Back Exhaust and Aluminum Skid Plate and experience a new level of performance and protection—your BMW deserves nothing less!

Turner Motorsport Rolled Angle Exhaust Tip - 3.0 Inlet - 3.0 OD - Stepped Left - Chrome brings a sleek and stylish upgrade to BMW exhaust systems. This high-quality exhaust tip features a striking chrome finish and a rolled angle, stepped design that adds both aesthetics and performance to your vehicle. Its precision design ensures a perfect fit and a bold look. With a 3.0-inch inlet and 3.0-inch outer diameter, this exhaust tip is designed to enhance the visual appeal of your BMW's exhaust system.

• Premium Chrome Finish: Adds a high-gloss, polished look to your vehicle’s exhaust.
• Rolled Angle Design: Provides a stylish and aggressive appearance.
• Stepped Left Design: Ensures a precise fit and a distinctive look.
• 3.0-Inch Inlet & Outer Diameter: Perfectly matches BMW exhaust systems for a seamless upgrade.
• Durable Construction: Built to withstand the elements and maintain its shine.

We are proud to introduce our latest exhaust offering, the Black Chrome Rolled Angle Exhaust Tip! This tip comes in a gorgeous chrome finish and features a rolled angle, stepped design. Warning - you may become obsessed with cleaning and taking care of these beautiful tips!

Other Features Include:

3.0 Inlet
3.0 Outer Diameter
Black chrome Finish
Left Stepped Design
Rolled Angle Design

Universal 2.5" inlet to 3.5" outlet exhaust tip. Priced per exhaust tip.

Over the years, it is not uncommon for exhaust tips to be damaged and corroded, becoming a "sore spot" of your BMW. To remedy this unsightly feature, we now offer our very own exhaust tips! Featuring stainless steel construction and a simple, yet sporty design, this exhaust tip will look perfectly at home on almost any model.

Features & Specifications:

Swivel feature for perfect alignment of the exhaust tips in the rear bumper
2.5" Inner Diameter
3.5" Outer Diameter
Mirror Chrome Finish
Double Wall Construction
Angle Cut Style
Includes Stainless Steel Clamp

Set of 2 universal 2.5" inlet to 3.5" outlet exhaust tips.

Over the years, it is not uncommon for exhaust tips to be damaged and corroded, becoming a "sore spot" of your BMW. To remedy this unsightly feature, we now offer our very own exhaust tips! Featuring stainless steel construction and a simple, yet sporty design, this exhaust tip will look perfectly at home on almost any model.

Features & Specifications:

Swivel feature for perfect alignment of the exhaust tips in the rear bumper
2.5" Inner Diameter
3.5" Outer Diameter
Brushed Aluminum Finish
Double Wall Construction
Angle Cut Style
Includes Stainless Steel Clamp

Set of 4 universal 2.5" inlet to 4.0" outlet exhaust tips.

Over the years, it is not uncommon for exhaust tips to be damaged and corroded, becoming a "sore spot" of your BMW. To remedy this unsightly feature, we now offer our very own exhaust tips! Featuring stainless steel construction and a simple, yet sporty design, this exhaust tip will look perfectly at home on almost any model.

Features & Specifications:

Swivel feature for perfect alignment of the exhaust tips in the rear bumper
2.5" Inner Diameter
4.0" Outer Diameter
Black Chrome
Double Wall Construction
Angle Cut Style
Includes Stainless Steel Clamp