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Description
Dinan Free Flow Axle-Back Exhaust for 2020-2024 BMW M340i/M440i D660-0085Dinan Free Flow Axle Back Exhaust 2020 2024 BMW M340i M440i Quad exhaust tips have been a signature feature of the most powerful letter in the automotive sphere for quite some time. It is a hallmark of the brand that Dinan has long embraced, limiting its own quad tip usage to those M cars that already sported like tip quantity from the factory. That is? until now with the release of the Dinan axle back exhaust system for the G20 M340i and G2x M440i.
Dinan Free Flow Axle-Back Exhaust - 2020-2024 BMW M340i/M440i
Quad exhaust tips have been a signature feature of the most powerful letter in the automotive sphere for quite some time. It is a hallmark of the brand that Dinan has long embraced, limiting its own quad tip usage to those M cars that already sported like tip quantity from the factory. That is? until now with the release of the Dinan axle back exhaust system for the G20 M340i and G2x M440i.
Features:
- More Power: +?6 HP @ 6600 RPM, + 5 LB-FT @ 6600 RPM
- Enjoyably louder, sportier sound
- Quad 4" diameter clamp-on, double-walled, polished and laser engraved exhaust tips
- 100% 304 stainless steel construction
- Larger diameter piping for increased flow (76mm vs 70mm)
- 4 lbs lighter than the stock system
- Stock exhaust valve actuator reused and another valve/actuator added to the opposing side promoting even flow regardless of valve position
- Computer controlled exhaust valves are retained and limit noise during low speed driving and open fully during high-load conditions
- Twin exhaust valves are a whopping 76mm diameter, making them 30% less restrictive than the OE valves
- Easy bolt-on installation with included mounting hardware
Specs:
| Brand | Dinan |
|---|---|
| Dinan Point Value | 3 |
| Emission Code | 5 |
| Height | 10 |
| Labor Time (Hours) | 2.5 |
| Length | 54 |
| Max HP Gain | 6 @ 6600 RPM |
| Max Torque (lb-ft) Gain | 5 @ 6600 RPM |
| Product Type | Axle-Back Exhaust |
| Tip Finish | Polished |
| Warning | California Proposition 65 |
| Weight | 68 |
| Width | 29 |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2024 | BMW | M340i | Base |
| 2020-2024 | BMW | M340i xDrive | Base |
| 2021-2024 | BMW | M440i xDrive | Base |
| 2021-2024 | BMW | M440i | Base |
| 2022-2024 | BMW | M440i | Base |
| 2022-2024 | BMW | M440i xDrive Gran Coupe | Base |
| 2022-2024 | BMW | M440i Gran Coupe | Base |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 1153 reviews
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Product Reviews
★★★★★ 5
Ralph Lauren quality without the price!!
Very soft sheets!! Exceptional quality! Good fit and great value! Got them for my guest bed on queen.. but hubby slept in there a few nights due to his back hurting. Gonna get some for the master king bed this spring. These are Ralph Lauren quality! And that’s all I have on my bed until now! We are those strange people that like sheets to feel cool when you get into bed.. and these are!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2026
★★★★★ 1
Disappointed in quality
Poorly made and not good quality. I had high hopes for these sheets because I love the color. However, after only the second laundering the hem stitching on the pillowcases is actually coming undone. Sleep-quality wise, I found the sheets a little scratchy for sateen, and while we’d hoped they would “sleep cool”, that is not the case. Unfortunately I washed them so I’m unable to return. They’ll go to the end of the line for rotation in emergencies only.
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Reviewed in the United States on May 3, 2026
★★★★★ 5
Good quality
Color: 01 - White, Size: Queen
I've had trouble with other all organic bedding on Amazon but this worked out. It did shrink a bit but it's cotton so it's supposed to do that. And it still fits on my bed pretty well so no complaints.
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Reviewed in the United States on March 21, 2026
★★★★★ 4
Not quite “Hotel” quality
3.5 stars.
My initial impressions are the followng:
- Definitely not “Hotel” quality construction. I found these a bit thin and poorly stitched/constructed compared to what one would expect of hotel quality linens .
- I doubt these are 500tc. They feel very flimsy, if I had to guess based on weight and feel alone I would assume 300tc at best.
- Washing does make them softer as is typical with sateen which I would recommend before use as they feel like Polyester right out of the bag. Wash before use.
- Color was interesting, not quite as expected. The grey/blue sheets have a seafoam green tint. Not bothersome enough for me to return.
- They feel cool to the touch and should keep one comfortable while sleeping. I will update my review if that is not the case.
Overall these are good sheets, but they are definitely not great/hotel quality. I’m keeping the ones I got for my children/guest rooms but will return mine as I really do want a higher quality sheet.
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Reviewed in the United States on March 28, 2026
★★★★★ 2
Disappointed. Very thin.
Color: 01 - White, Size: King
These sheets are so thin. I bought the white color and you can see the mattress and the white stripes on the pillows through them. I love my Beckham pillows so I thought the quality would be better. I wasn’t in a rush to use them and unfortunately missed my return window.
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Reviewed in the United States on March 28, 2026