Dinan dnnD660-0099-BLK Valved Cat-Back Exhaust System with Black Tips

While looks are important, the auditory advantages are what any enthusiast is truly after with an exhaust system, and the Dinan offering for the G01/G02 M40i platform delivers in spades. For not only aural enhancement via the elimination of the central collector/resonator, but also weight savings and simplicity. The stock single-to-dual pipe setup has been abandoned in favor of an enlarged, straight, unrestricted, and freer flowing single pipe system. This pathway feeds into a Helmholtz equipped muffler that limits frequencies associated with drone, as well as assists in altering the overall tone of the setup to deliver the signature low Dinan rumble. The no-nonsense design allows versatility in volume levels with the retained factory valve functionality. Go from refined when cruising (low RPM’s) to rowdy when in it (high RPM’s), with ease. Or better yet, pair the system with an exhaust valve remote and have full control of elevating or reducing the sound! When open, the system behaves as a straight pipe solution that promotes maximum flow and volume for an exhilarating and forceful chorus. When the valve is closed however, exhaust gases are wholly redirected through the muffler and emit more tempered vocals acceptable for even the most sensitive ears. It is the perfect blend of civility when cruising or the full spectrum of auditory delight when in the throttle. No matter the situation, the Dinan valved cat-back exhaust system is the answer for the discerning enthusiast looking for sound without sacrifice. Stainless Steel - Black Tips - G01/G02

• Factory-like fitment with included mounting hardware and valve componentry for both pre-LCI and LCI compatibility
• Quad 3.75-inch (95mm) double-walled, black ceramic coated, clamp-on tips with laser engraved Dinan logo
• Factory valve functionality retained; refined or rowdy from the same exhaust
• 7-pounds lighter than the stock system (60-pounds vs. Dinan: 53-pounds)
• Enjoyably louder, sportier sound w/ a delightful octave drop
• Drone abatement technologies used to reduce cabin resonance
• Larger diameter piping for increased flow (83mm vs. 80mm)
• Factory resonator/collector removed for increased volume
• Direct bolt-on w/ no cutting or welding required
• Maximum gains of +6 HP and +5 lb-ft of torque
• 100% 304 Stainless Steel construction

Brief Description: The Dinan dnnD660-0099-BLK valved cat-back exhaust system is designed for BMW X3 M40i and X4 M40i models using the G01/G02 platform. This stainless steel system removes the factory resonator/collector and replaces the stock single-to-dual arrangement with an enlarged, straight, freer-flowing single-pipe design. A Helmholtz-equipped muffler helps reduce drone while delivering a deeper Dinan exhaust tone.

Key Features & Performance Benefits:

• Valved Sound Control: Retains factory valve functionality for a refined cruising sound or a louder, sportier tone under acceleration.
• Improved Exhaust Flow: Larger-diameter piping and the removal of the factory resonator/collector support increased flow, with claimed maximum gains of 6 HP and 5 lb-ft of torque.
• Reduced Cabin Resonance: Helmholtz-based drone abatement technology helps limit unwanted exhaust frequencies.
• Weight Savings: The system weighs 53 pounds, which is 7 pounds lighter than the 60-pound stock system.

Key Product Specifications & Technical Data:

• Brand: Dinan
• Part Number: dnnD660-0099-BLK
• Application: BMW X3 M40i/X4 M40i G01/G02 platform
• System Type: Valved cat-back exhaust system
• Material: 100% 304 stainless steel
• Tip Configuration: Quad 3.75-inch double-walled black ceramic-coated clamp-on tips
• Piping Diameter: 83 mm, compared with the factory 80 mm piping
• Installation: Direct bolt-on design with no cutting or welding required

What's Included in the Box: The product data states that mounting hardware and valve componentry are included for pre-LCI and LCI compatibility. The shipment consists of two boxes.

Fitment: Fits 2018-2023 BMW X3 models and 2019-2022 BMW X4 models as listed, including BMW X3 M40i and X4 M40i applications on the G01/G02 platform.

Fitments:
2018 BMW X3 M40i
2019 BMW X3 M40i
2019 BMW X4 M40i
2020 BMW X3 M40i
2020 BMW X4 M40i
2021 BMW X3 M40i
2021 BMW X4 M40i
2022 BMW X3 M40i
2022 BMW X4 M40i
2023 BMW X3 M40i
2023 BMW X4 M40i
2024 BMW X3 M40i
2024 BMW X4 M40i
2025 BMW X4 M40i

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1
Number Of Boxes: 2