SKU: 25418702852

034Motorsport Density Line Control Arm Kit - Audi B9/B9.5 A4/S4/RS4/A5/S5/RS5 - 034-401-1074

Sale price$969.74 Regular price$1077.49
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Ships within 48 hours · Estimated delivery Aug 5 - Aug 10

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Description

034Motorsport Density Line Control Arm Kit - Audi B9/B9.5 A4/S4/RS4/A5/S5/RS5 - 034-401-1074034 Motorsport Density Line Control Arm Kit Audi B9 B9. 5 A4 S4 RS4 A5 S5 RS5 034 401 1074. 034 Motorsport Density Line Lower Control Arm Kits are available with Density Line Non Adjustable Upper Control Arms! Replace your vehicle's aging, worn control arms with these performance engineered Density Line units with adjustable upper arms to restore feel and improve handling precision beyond factory levels. Density Line (Non Adjustable): Direct

034 Motorsport - Density Line Control Arm Kit - Audi B9/B9.5 A4/S4/RS4/A5/S5/RS5 - 034-401-1074.

034 Motorsport Density Line Lower Control Arm Kits are available with Density Line Non-Adjustable Upper Control Arms! Replace your vehicle's aging, worn control arms with these performance-engineered Density Line units with adjustable upper arms to restore feel and improve handling precision beyond factory levels.

  • Density Line (Non-Adjustable): Direct replacement of the factory control arms, performance-engineered with Density Line bushings to restore handling precision beyond factory levels.

034Motorsport's complete Density Line Control Arm Kit with Non-Adjustable Control Arms and are designed to be performance replacements for all eight of the factory front upper and lower control arms. The result is tighter handling and more precise steering response than even brand new factory control arms can offer. In addition, adjustable upper control arms allow optimal alignment for your lowered or track driven vehicle.

The factory front control arms are an integral part of the suspension, but can start wearing out as early as 40,000 miles - especially on enthusiast-owned vehicles which are driven hard on the street or track. As the rubber bushings degrade and ball joints develop play, alignment is compromised and steering becomes less precise. This kit is a drop-in replacement with feature improvements over stock, that will tighten up the front-end feel!

DENSITY LINE NON-ADJUSTABLE CONTROL ARMS:

034Motorsport's complete Density Line Control Arms are designed to be a performance replacement for all factory front control arms. Featuring high-durometer rubber bushings and high-quality ball joints, Density Line Control Arms are engineered to limit unwanted deflection in the suspension, resulting in tighter handling and more precise steering response than even brand-new factory control arms can offer.

FEATURES:

Density Line Non-Adjustable:

  • Complete, Drop-In Replacement for Factory Upper & Lower Control Arms
  • Offers Improved Handling Feel & Steering Precision
  • High-Durometer Rubber Bushings (65-70 Durometer)
  • Includes New Hardware

WHAT'S INCLUDED:

  • Front Lower Control Arms - Front (Left & Right)
  • Front Lower Control Arms - Rear (Left & Right)
  • Density Line Upper Control Arms:
    • CNC Machined Billet Upper Adjustable Control Arms - Front (Left & Right)
    • CNC Machined Billet Upper Adjustable Control Arms - Rear (Left & Right)
    • Rubber Spherical Bearing Dust Boots
      Or
    • Front Upper Control Arms - Front (Left & Right)
    • Front Upper Control Arms - Rear (Left & Right)
  • Installation Hardware Kit

OE PART INTERCHANGE:

Upper Arms:

  • 8W0407505C
  • 8W0407506C
  • 8W0407509B
  • 8W0407510B

Lower Arms:

  • Control Arm Front Left: 8W0 407 151 A/B/C/D
  • Control Arm Front Right: 8W0 407 152 A/B/C/D
  • Control Arm Rear Left: 8W0 407 693 B
  • Control Arm Rear Right: 8W0 407 694 B
  • Ball Joint Front Right and Left: 8W0 407 689 B

FITMENT:

Make Model Years Chassis Engine
Audi A4 2017+ B9/B9.5 2.0 TFSI
Audi A5 2018+ B9/B9.5 2.0 TFSI
Audi allroad 2017+ B9/B9.5 2.0 TFSI
Audi RS5 2018+ B9/B9.5 2.9 TFSI
Audi S4 2018+ B9 3.0 TFSI
Audi S5 2018+ B9/B9.5 3.0 TFSI


INSTALLATION:

The installation of your Density Line Control Arm Kits, B9/B9.5 Audi A4/S4/RS4, A5/S5/RS5 is a straightforward process that will take approximately 4 hours to complete. 

Download the Density Line Control Arm Kits, B9/B9.5 Audi A4/S4/RS4, A5/S5/RS5 Install Guide

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 25418702852

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4.4 ★★★★★
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Product Reviews
T
Verified Purchase
Terrible!
New York, US
★★★★★ 1
Not worth the money
Style: 2026 Model, Size: 55-Inch
Nothing I wanted. Totally disappointed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
T
Verified Purchase
The Right Tool
Lake Worth, US
★★★★★ 5
Setup Is SOO Easy - Compact Size - Intuitive - Automatic Device Connections
Size: 1 add-on extender, Configuration: without eero Plus, Size: 1 add-on extender, Configuration: without eero Plus
We were hoping to solve an issue we were having with our Wifi setup which prevented us from reliably connection to our two alley cameras and interior garage camera/door opener. These 3 devices were just a bit too far from our Wifi to get a strong connection to stream a video feed, though strong enough to stay connected. However, after install this extender, the signal is super strong and connecting to these cameras is much faster. Setup and usage was also SUPER simple. Since we are already running an Eero setup with 2 routers, install was as simple as plugging the device in, opening the app and clicking through just a couple buttons to start the automatic process for building out the network. Best of all, each of the alley devices are automatically connecting to the extender without needing to manually assign them, so convenient! If you're concerned about compatibility, we had no issues running this with the Eero 6e routers found here https://amzn.to/41kfEv5 I can't speak to all the compatible options but the Eero 6 and 6e routers are a sure bet. So for us, the coverage and stability of the network is now excellent across all devices and we finally have proper functionality of all our connected devices.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
H
Verified Purchase
Heather
New York, US
★★★★★ 5
So Far So Good
Size: 1 router, Configuration: without eero Plus
My modem crashed a few months ago and Spectrum had to replace the system. I learned during that installation that I was being charged an extra $10/month for my router. Didn't realize that for 5 years, I was only "renting" my router. Which has been an absolute waste of $600. During the initial install, I was not informed of that and I have never seen an actual paper statement for my bill breaking down my plan. My first Spectrum router was very spotty towards the back of my house (1050sq ft. house) and the new router which was supposed to be an upgrade to Wi-Fi 6, was even worse. My phone would lose connection to the new router on my front porch which is 5 feet away from my router. I initially thought that all I needed was an extender and that is how the Spectrum guy and I got on the subject because I am NOT very tech savvy. I had already been looking at the Eero router and he recommended it. I found the one that is compatible to my internet plan (400Mbps) and went for it while it was on sale. This router is very well packaged. Very pretty packaging, too. OMG!! Super super easy to install. Your grandparents could install this. The only thing that I recommend is being sure of your password which you should be able to find in your providers app (at least I can with Spectrum). If you do happen to forget one digit to your password, and you accidentally change your password, you will have to reconnect each device individually. This router was compatible with my internet plan and provider. I'm very happy with the quality, signal strength, functionality. It has been very reliable for the three days that I have had it. I have not lost signal once. Not even on my front porch. My phone is now showing that I am connected to Wi-Fi 6 when before, it kept dropping it and dropping back down to 5G. Even with the 5G, it would buffer really bad. I got this on sale and I do think that the price is competitive for how well this router performs. The app is super easy to navigate and every device that is linked to your router is located in the app. You can monitor what devices are connecting to your router. I do think that this Eero router was the upgrade to my internet plan. I would recommend saving yourself the cost to "rent" your router through your service provider and upgrading to the Eero router. This will pay for itself in 6 months now that I am not "renting" my router.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 19, 2025
I
Verified Purchase
Idin Javadi
Boise, US
★★★★★ 5
Better than most!
Size: 1 add-on extender, Configuration: without eero Plus
I found that this extender works better than most in that it seamlessly boosts the signal without having to switch networks. The set up was super simple and easy, just plug and play basically. Does exactly as advertised, only about a 30% reduction in speed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
M
Verified Purchase
MAC4Freedom
Charlottesville, US
★★★★★ 4
Almost perfect...
Size: 1 router + 2 extenders, Configuration: without eero Plus
I needed to extend my wireless reception for my home office. This was recommended by the cable guy and was easy to install. Instead of just picking up a signal and patching it through, it creates a web in my home and extends the wi-fi not only to my office, but upstairs as well. It works with my Comcast modem and provides much greater speed and coverage in my home. It's not perfect as I still get occasional freezing when on video calls, but unless I want to move my office to the dining room this will have to do. I don't know how much this should cost, but I had a little bonus money so I spent it on this upgrade. It seems to be worth it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 4, 2026

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