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Description
Dinan Free Flow Valved Axle Back Exhaust | BMW M340i 19-20Quad 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. While some may scoff at the feature being implemented into a "pseudo M," the
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.
While some may scoff at the feature being implemented into a "pseudo-M," the M340i, and the B58 engine platform, are extremely potent and worthy of such a distinction. The factory valance also accommodates the four massive 102mm tips perfectly, further cementing our opinion that the quad tips were destined to be on this performance model. Being numerous and big are not the only selling points to the tips however. Dinan has retained its signature straight cut tip design, safeguarding its unique and elegant styling position amongst a crowded marketplace full of angle cuts. With systems available with either black ceramic coated or polished clamp-on, and laser engraved exhaust tips, there is a version that is sure to meet your individual aesthetic needs.
The use of quad tips also presented some additional challenges and fostered some innovation to the already visually impressive system constructed entirely of TIG welded and brushed T304 stainless steel. Confined to dual tips, the factory system utilizes only one exhaust valve and functions by eliminating the passenger side tip when the valve is closed, siphoning all gases through the muffler and out the driver's side tip for quieter operation. With the introduction of more pipes/tips, this methodology was not practical, or desired. In true Dinan M exhaust fashion, our talented engineering team decided that integrating a second valve to the system would garner the most favorable results in both symmetry and overall sound. The result is a system that incorporates larger 76mm tubing (vs 70mm stock) and allows freer flow through the entirety of the system but specifically to both outer pipes when the enlarged valves are open. The resulting flow and sound mimics an awe-inspiring straight pipe solution with a deeper and meatier tone, a defining element of all Dinan exhausts. In contradiction to the aggressiveness resulting from open valves, when the valves are closed, all gasses are forced into the muffler for sound deadening and exit the two inner tips. Regardless of valve position, the intimate nature of the interior is retained so conversation can continue without an excessively loud drone courtesy of numerous drone abatement technologies in the can. With the Dinan exhaust equipped on the M340i you get the best of both worlds; aggressive tone/sound and civility. A combination that is a paramount to any M exhaust, and now by virtue of tip count, the M340i. Welcome to the illustrious family.
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
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Product Reviews
★★★★★ 5
Great scent
Love the scent, keep a set in guest room for company. Everyone seems to like.
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Reviewed in the United States on November 6, 2025
★★★★★ 5
Smells amazing
I recently stayed at The Westin Anaheim and found I really loved their bathing line. I wanted to purchase it and bring it back with me but had absolutely no room in my luggage. I was very pleased to see I could buy it on Amazon. My husband’s bathroom has always been very sparse and kind of thrown together with random shampoos and body washes so I used this bundle to start transforming it into a nicer, better smelling bathroom that appears more cohesive and appealing. It absolutely worked and I also love how he smells after showering now! He loves that I’m all over him because he smells so nice! The scent of the products is very relaxing.
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Reviewed in the United States on September 9, 2024
★★★★★ 5
So good!
Such great quality. Great scent that’s lasts all day but isn’t overpowering. I love the Westin products!
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Reviewed in the United States on July 28, 2024
★★★★★ 4
Great smell minimal lather
These were very expensive and I would hope that they would be very high-end products. They smell wonderful, but neither the shampoo nor the body wash is big on the lather, and you tend to use more than you probably should. The lotion is nice and smells nice as well. I have not yet used the soap disks. I do think the price point is a bit ridiculous for the amount of product you get, but I guess if you’re looking for the smell, then it is worth it.
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Reviewed in the United States on January 21, 2024
★★★★★ 5
best ever
had numerous skin issues including extremely dry hands and scalp , My itching was drastically reduced. a life saver
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Reviewed in the United States on August 14, 2023