The G8x M3/M4 takes a step up in nearly every aspect compared to its predecessor, but many enthusiasts agree that the sound could use a little love. Just like the F8x with the S55 engine, the S58 in this generation has some room for improvement in the audio department. While it’s a move in the right direction, the stock sound still has a bit too much rasp and doesn’t quite capture the refined aggressiveness that fans expect from these iconic performance models. That’s where Dinan comes in, offering a valved axle-back exhaust system that transforms the tone into something deeper and more resonant, while also cranking up the volume beyond what the stock system delivers. Pair it with the optional middle exhaust/x-pipe, and you can achieve an even bolder, smoother, and fuller soundtrack.
Dinan has put in a ton of effort into developing and testing this exhaust system, trying out nearly every possible configuration. Unlike the previous generation, where the cabin sound and drone were pretty similar between the sedan and coupe, the G8x chassis presented some unique challenges. This led to numerous iterations as we sought a system that not only sounds fantastic outside but also keeps cabin noise in check for both body styles. The result? A system that we believe will be cherished by enthusiasts for years to come. To achieve the sound volume and tone that befits the G8x M3/M4, we’ve increased the tubing size to 76mm (up from the stock 70mm), allowing for better airflow and reduced backpressure throughout the system. The larger pipes create multiple pathways as they approach the rear of the vehicle, with the factory exhaust valves directing the flow. When the valves are closed, exhaust gases flow into the Dinan muffler, using absorption and reactive technologies to create a more subdued, yet deeper and pleasing note. But when those valves open up during high-load conditions, the gases can bypass the muffler entirely, giving you a near straight-pipe experience for maximum auditory pleasure. It’s the perfect blend for any driving scenario, allowing for a calm demeanor or a spirited roar depending on your mood. This combination is something Dinan feels is just right for the brand's signature performance models, catering to the discerning enthusiast who wants the best of both worlds.
On the visual side, the Dinan G8x M3/M4 exhaust is crafted from T304 stainless steel and TIG welded to ensure a stunning finish. The entire system boasts a brush finish that guarantees it looks immaculate right out of the box. We didn’t stop at the parts you can’t see; the exhaust tips are a standout feature too. The Dinan exhaust comes with impressive quad 4.5-inch (114mm) double-walled, black ceramic-coated clamp-on tips, complete with a laser-engraved Dinan logo. While they might seem oversized on paper, these tips fit perfectly and fill the factory cut-outs, giving your ride an OEM+ look with a touch of attitude.
Features:
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| BMW M3 | 2021-2025 | Competition |
| BMW M3 | 2021-2025 | Base |
| BMW M3 | 2022-2025 | Competition xDrive |
| BMW M3 | 2024 | CS |
| BMW M4 | 2021-2025 | Competition |
| BMW M4 | 2021-2025 | Base |
| BMW M4 | 2022-2025 | Competition xDrive |
| BMW M4 | 2023 | CSL |
| BMW M4 | 2023 | Competition Heritage |
| BMW M4 | 2025 | CS |

Dinan was founded in 1979 and has since established itself as North America’s premiere BMW tuner. The company produces the most comprehensive product line of high-performance parts and systems which are also distributed in selected BMW dealerships and independent BMW High-performance service facilities. Today, they have expanded their product range by offering their products for other European brands as well such as Mini and Mercedes Benz.
European Car ExpertsDinan has consistently produced quality parts and is considered as a company who serves the industry-leading warranty program. This has helped the company become a household name for the majority of BMW enthusiasts.
The company is known to produce parts that are reliable and enhance the performance of the cars. As proof, reputable publications have conducted road tests on vehicles equipped with Dinan products, and the results show that these vehicles are at par with some of the most exotic cars in the world.
The company offers a variety of products ranging from suspension parts, electronics, drivelines, chassis tuning components, and engines. Dinan understands that every BMW driver wants to improve their vehicle. Hence, they produce products that bring out the best out of the vehicle. They have become the brand of choice by tuners who demand the best, and Dinan has consistently given it to them over the years.
Purchase Dinan Products at Vivid RacingEuropean cars are known to be the most reliable and top-performing cars in the market. But it does not hinder enthusiasts to further exploit its potential. Dinan is the expert when it comes to improving these cars and has been trusted by many. Visit Vivid Racing and check out their list of products that would fit your specific requirement.
We consider our limited warranty coverage to be a very important component of each Dinan Performance Product and we want you to fully understand it. Dinan's objective is to enhance the enthusiast's driving experience by designing and manufacturing the best performing and highest quality automotive products possible. Our limited warranty is intended to cover Dinan products when they are used in the manner for which they were originally designed. Like any manufacturer, we cannot be responsible when our products are subjected to misuse, improper installation, misapplication, modification or neglect. Consumers are encouraged to familiarize themselves with the specifics of Dinan's Limited Warranty, including exclusions and potential effects to the manufacturer's limited new car warranty, prior to making the decision to purchase and install Dinan products and systems. Consumers are invited to contact Dinan at 408-779-8584 with any questions regarding Dinan's limited warranty coverage, procedures, exclusions, etc.
Enthusiast customers should also be aware of the Magnuson Moss Warranty Act which can be viewed in its entirety here.
CARS COVERED BY THE ORIGINAL VEHICLE MANUFACTURER'S NEW CAR LIMITED WARRANTY
US and Canadian Specification Vehicles Only. Outside of the aforementioned areas please contact your importer for details.
If your vehicle is currently covered by the vehicle manufacturer's new car limited warranty, Dinan products are warranted for the remaining term of the vehicle manufacturer's new car limited warranty. The manufacturer's new car warranty is limited to 4 years or 50,000 miles (80,000 kilometers in Canada), commencing on the date of first retail sale or the date the vehicle is first placed in-service as a demonstrator or company vehicle, whichever is earlier. Dinan's warranties are transferable when ownership of the vehicle into which the Dinan products were originally installed is sold.
To obtain service under this warranty, the vehicle must be brought, upon discovery of a malfunction or defect in materials and/or workmanship, to the workshop of any Authorized Dinan Dealer, during normal business hours. Proof of purchase in the form of a lawful invoice is required. The Authorized Dinan Dealer will, without charge for parts or labor, repair or replace the defective Dinan component(s), as well as any original vehicle manufacturer's component(s) that may have been directly affected by a Dinan component, using new or authorized remanufactured parts. The decision to repair or replace said parts is at the sole discretion of Dinan and/or the original vehicle manufacturer. Parts for which replacements are supplied under this limited warranty become the property of Dinan and/or the original vehicle manufacturer. In all cases, a reasonable period of time must be allowed for warranty repairs to be completed after the vehicle is delivered to the Authorized Dinan Dealer.
CARS NO LONGER COVERED BY THE ORIGINAL VEHICLE MANUFACTURER’S NEW CAR LIMITED WARRANTY
Dinan Performance Products are warranted for a 2-year, unlimited mileage period from the date of original purchase. Dinan's warranties are transferable when ownership of the vehicle into which the Dinan products were originally installed is sold.
To obtain service under this warranty, the vehicle or Dinan product must be brought, upon discovery of a malfunction or defect in materials and/or workmanship, to any Authorized Dinan Dealer during normal business hours. In the event of a warranty claim, Dinan will repair or replace, at its sole discretion, any defective Dinan component upon receipt of the item and proof of the original purchase in the form of a lawful invoice. This warranty does not include reimbursement for repairs to any original vehicle manufacturer's component(s) that may have been affected by a Dinan component. Labor charges associated with the repair or replacement of a Dinan product will be reimbursed at the Authorized Dinan Dealer’s standard hourly rate, based upon the original vehicle manufacturer's and/or Dinan's schedule of flat rate labor times. The defective component must be returned to Dinan for verification of the defect before any warranty adjustment will be made. A reasonable period of time must be allowed for warranty replacement, shipping and/or repairs to be completed after the vehicle or product is received by an Authorized Dinan Dealer or Dinan's facility.
DINANTRONICS SPORT PRODUCT WARRANTY
DINANTRONICS Sport products are warranted against material and workmanship defects for a 1-year, unlimited mileage period from the date of original purchase. This warranty does not cover any consequential damages (neither parts nor labor) that may be caused as a result of the installation or use of this product.
To obtain service under this warranty, Dinan tech support must be made aware of the malfunction or defect in materials and/or workmanship of the DINANTRONICS Sport module upon discovery, via an Authorized Independent Dinan Dealer or directly to Dinan during normal business hours. In the event of a valid warranty claim, Dinan will repair or replace, at its sole discretion, any defective Dinan component upon receipt of the item and proof of the original purchase in the form of a lawful invoice. In the event of a defect the defective unit must be returned to Dinan for verification of the defect before any reimbursements will be issued. A reasonable period of time must be allowed for warranty replacement, shipping and/or repairs to be completed after the product is received by an Authorized Dinan Dealer or Dinan's facility.
REFURBISHED PRODUCT WARRANTY
Refurbished products are warranted against material and workmanship defects for a 90-day, unlimited mileage period from the date of original purchase. This warranty does not cover any consequential damages (neither parts nor labor) that may be caused as a result of the installation or use of this product.
To obtain service under this warranty, Dinan tech support must be made aware of the malfunction or defect in materials and/or workmanship of the refurbished product upon discovery, via an Authorized Independent Dinan Dealer or directly to Dinan during normal business hours. In the event of a valid warranty claim, Dinan will repair or replace, at its sole discretion, any defective Dinan component upon receipt of the item and proof of the original purchase in the form of a lawful invoice. In the event of a defect the defective unit must be returned to Dinan for verification of the defect before any reimbursements will be issued. A reasonable period of time must be allowed for warranty replacement, shipping and/or repairs to be completed after the product is received by an Authorized Dinan Dealer or Dinan's facility.
RACING ONLY PRODUCTS
Due to the nature of the intended use, Dinan Racing Products are guaranteed against defects in workmanship only. These products are not warranted against wear and/or failure under any circumstances. These products do not fall under the standard Dinan Limited Product Warranty. Racing-only parts may also affect the BMW warranty and emissions warranty.
The Dinan Limited Warranty Specifically Excludes:
Return shipping charges, towing charges, rental car fees damage to a component or assembly due to the installation of replacement parts with specifications that differ in any material respect from the original vehicle manufacturer's or Dinan parts, damage resulting from the unauthorized modification of a Dinan part or assembly, damage resulting from the use of other manufacturer's products in conjunction with Dinan products or systems, damage to the clutch due to power shifting or abuse, brake rotor warp, friction materials, maintenance services and parts when replaced during maintenance such as spark plugs, lubricants, fluids, engine tune-up parts, replacement of filters, coolant and refrigerant, mechanical adjustments or repairs which result from normal wear and tear, drive-belts, light bulbs, damage due to the failure to perform maintenance services at the specified intervals or in accordance with the instructions in the owner’s manual from the original vehicle manufacturer or Dinan's product instructions, damage attributable to negligence or abuse, improper installation, improper treatment or treatment contrary to the instructions in the owner’s manual from the original vehicle manufacturer or Dinan's product instructions, engine damage resulting from alteration of Dinan's original boost pressure, damage resulting from the use of improper or contaminated fuel, damage occurring through corrosion resulting from weak or improper coolant, damage to a Dinan component as a result of a collision or improper collision damage repairs, any vehicle operated in any competitive event or subjected to aggressive track conditions, custom-designed competition parts, damages resulting from loss of time, inconvenience or loss of the use of the vehicle, damage resulting from environmental influences, flood, accident, fire damage, or road salt corrosion, re-manufactured or refurbished products or components (these products are clearly identified as re-furbished and are warranted for the period specified for that particular product).
General
The installation of Dinan Performance Products and systems may affect the vehicle manufacturer's new car limited warranty. The vehicle manufacturer's new car limited warranty may not apply to modifications to a vehicle or the installation of any performance accessories or components attached to the vehicle which substantially alter the original engineering and/or operating specifications or which result in damage to other original vehicle manufacturer's components.
This warranty shall be null and void if the vehicle identification number has been altered or cannot be read, if the odometer has been replaced or altered and the true mileage cannot be determined, if the vehicle has been declared a total loss or sold for salvage purposes, or if the vehicle has been used in any competitive event.
These warranties give you specific legal rights, and you may also have other rights, which vary, from state to state.
The duration of any implied warranties, including the implied warranty of merchantability and fitness for a particular use, is limited to the duration of the express warranties herein. Dinan hereby excludes incidental and consequential damages, including loss of time, inconvenience, or loss of the use of the vehicle, for any breach of any express or implied warranty, including the implied warranty of merchantability and fitness for a particular use, applicable to the product.
Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so the above limitations and exclusions may not apply to you.
Statement Revised 08/03/2018