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Exhaust› Exhaust Pipes, Systems and Components
Dinan
FREEFLOW EXHAUST; G01 X3 M40i
SKU: D00G D660-0099
Moderate — 2–4 hours
Overview
Show original supplier description
Part #: D660-0099
Looking to elevate the acoustics of your X3 M40i / X4 M40i with an exhaust system that not only offers a much-improved sound while retaining the the flexibility associated with valves, but also raises the eye appeal beyond the mundane Look no further than the Dinan valved cat-back to meet all your needs and then some!
Features:
- Maximum gains of +6 HP and +5 lb-ft of torque
- Enjoyably louder, sportier sound w/ a delightful octave drop
- Drone abatement technologies used to reduce cabin resonance
- Quad 3.75-inch (95mm) double-walled, polished (or black ceramic coated) clamp-on tips with laser engraved Dinan logo
- Larger diameter piping for increased flow (83mm vs. 80mm)
- Factory resonator/collector removed for increased volume
- 7-pounds lighter than the stock system (60-pounds vs. Dinan: 53-pounds)
- 100% 304 Stainless Steel construction
- Factory valve functionality retained; refined or rowdy from the same exhaust
- Direct bolt-on w/ no cutting or welding required
- Factory-like fitment with included mounting hardware and valve componentry for both pre-LCI and LCI compatibility
Stainless Steel - Polished Tips - G01/G02
Vehicle Symptoms
- Stock exhaust too quiet
- Want a sportier exhaust note
- Looking for more power and torque
- Desire for valved exhaust control
- Want to reduce exhaust weight
Relevant Conversations
- BMW X3 M40i exhaust upgrade suggestions
- Dinan cat-back exhaust review X4 M40i
- Best valved exhaust for G01 M40i
- How to install Dinan exhaust on X3 M40i
- Dinan vs Akrapovic exhaust sound comparison
- X3 M40i exhaust drone fix
- Dinan exhaust HP gains real world
- Polished vs black ceramic tips Dinan exhaust
- X4 M40i exhaust valve retrofit
- Dinan D660-0099 installation time
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Dinan |
| Part Number | D00G D660-0099 |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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