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

(1975-1979 Buick Skylark; 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 D660-0046-BLK Dinan D660-0086-BLK Dinan D660-3950

Manufacturer

Picture for manufacturer Dinan

Part Number

D660-0055
13 reviews
Sale Price

$1,649.95

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Dinan D660-0055 Free Flow Axle-Back Exhaust transforms your 2016-2020 BMW 340i or 440i with an enhanced sporty exhaust note while delivering measurable performance gains. This premium exhaust system features a sophisticated Helmholtz resonator chamber that eliminates unwanted drone, allowing you to enjoy the deeper, more aggressive sound without highway fatigue.

Performance Gains:

  • +6 horsepower at 6,600 RPM
  • +5 lb-ft of torque at 6,600 RPM
  • Improved exhaust flow for better throttle response

Premium Construction Features:

  • 100% 304 stainless steel construction for maximum durability and corrosion resistance
  • Twin 89mm (3.5-inch) exhaust tips available in polished or ceramic black finish with laser-engraved Dinan logo
  • Engineered Helmholtz chamber design reduces interior drone while maintaining aggressive exhaust tone
  • Utilizes factory mounting brackets and hangers for OEM-quality fitment
  • Direct bolt-on installation with no modifications required

Dinan's engineering expertise ensures this axle-back exhaust delivers the perfect balance of performance, sound quality, and refinement. The system installs using all factory mounting points, ensuring a stable, rattle-free fit that maintains the quality standards BMW owners expect.

Products specifications

Fits

1975-1979 Buick Skylark; 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

Prop 65

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

Material

Stainless Steel

Tip Diameter

3.500 in.

Exhaust Type

Axle-Back

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

Polished

Warning

California Proposition 65

Weight

45

Width

30

Web site works well. It would be better if you provided expected ship and arrival dates. Item received in new condition. Best price on the internet. Thanks!

Easy order using paypal

Good website, Thought the fuel jugs would come with a pour spout. They are only the jugs though.

Need to send back my brackets I just got today from you guys. They are not for my truck so I needed to get these ASAP

quick and convenient

easy

Fast & Easy

Easy

This positive feedback is after purchase survey. Havnt recieved product yet

good pricing and nice shipping discount

Low prices and super fast shipping.

Great prices, filled and shipped immediately. Best deal around!

Amazing prices!

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