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Dinan D660-0055-BLK Free Flow Axle-Back Exhaust System for BMW 340i/440i

(1984-1990 Ford Bronco II; 2016-2018 BMW 340i; 2016-2018 BMW 340i xDrive; 2017-2020 BMW 440i; 2017-2020 BMW 440i xDrive; 2019 BMW 340i GT xDrive)

Part of: Dinan Free Flow Axle-Back Exhaust System

Other options in this family: Dinan D660-4602 Dinan D660-0050-BLK Dinan D660-3950 Dinan D660-0046-BLK Dinan D660-0086-BLK

Manufacturer

Picture for manufacturer Dinan

Part Number

D660-0055-BLK
14 reviews
Sale Price

$1,649.95

1 left at this price

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Dinan Free Flow Axle-Back Exhaust System delivers enhanced performance and an aggressive exhaust note for 2016-2020 BMW 340i and 440i models. Engineered to reduce backpressure while maintaining refined sound quality, this exhaust system adds measurable power gains throughout the RPM range.

Performance Gains:

  • +6 horsepower at 6600 RPM
  • +5 lb-ft of torque at 6600 RPM
  • Improved exhaust flow for better throttle response

Key Features:

  • 100% 304 stainless steel construction for durability and corrosion resistance
  • Integrated Helmholtz resonance chamber eliminates cabin drone
  • Twin 89mm (3.5-inch) polished or ceramic black exhaust tips with laser engraving
  • Direct bolt-on installation using factory brackets and hangers
  • Sportier, more aggressive exhaust tone without excessive volume

This axle-back system replaces the restrictive factory mufflers and piping from the rear axle to the tips. The precisely tuned Helmholtz chamber technology provides a deeper, more engaging sound during acceleration while preventing unwanted drone during highway cruising. Factory-style fitment ensures a clean, professional installation with no modifications required.

Products specifications

Fits

1984-1990 Ford Bronco II; 2016-2018 BMW 340i; 2016-2018 BMW 340i xDrive; 2017-2020 BMW 440i; 2017-2020 BMW 440i xDrive; 2019 BMW 340i GT xDrive

Brand

Dinan

Material

304S Stainless Steel

Tip Diameter

3.500 in.

Exhaust Type

Axle-Back

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Category

Exhaust

Dinan Point Value

3

Emission Code

5

Height

11

Labor Time (Hours)

1.2

Length

48

Max HP Gain

6 @ 6600 RPM

Max Torque (lb-ft) Gain

5 @ 6600 RPM

Product Type

Axle-Back Exhaust

Sub Category

Exhaust and Tail Pipes

Tip Finish

Black Ceramic Coated

Warning

California Proposition 65

Weight

45

Width

30

great for now

Lowest pricing. very simple process from start to checkout. A+++

way cheaper than everywhere else. Lets hope the product is good!

It was a smooth transaction, very pleased.

Great service

great

Great

good

It was easy as 1, 2, 3

so far so good

Best prices that I have seen. I bought some Bilstein 5100 adjustables, got the with in 4 business days. No problem at all. Will buy from Autoplicity.com again.

So far so good

just fine, appreciate your free services I am unable to tell if I am satisfied with product as of yet.. wwait till I pull all my hair out and I will tell you..

Great product, looked evey where for the right brand on my spedomder cable. Product worked as advertised!! Look forward to working with guys again. Thanks

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