Audi A4 & S4 Door Blades – A Complete Guide to B6 / B7 Door Blade Installation

Guide credited to Nick Roshon. 

One interesting design cue in the B6 / B7 (2001.5-2008) Audi A4 and S4 is the door blades – these fins protrude from underneath the door and give the car a more sporty look that is uniquely Audi – you won’t see door blades like this on any other car. There are three styles of door blades you can install on your Audi A4/S4, and they’re all universal between B6 and B7 body styles, as well as A4, S4, and RS4 models in the sedan or avant format (the convertible does have different door blades however). The three styles are:

1. Audi A4 Door Blades – completely flat and they do not poke out from the side skirt at all.
2. Audi A4 S-Line or USP (Ultra Sport Package) Door Blades – these look like the S4 door blades (above) only smaller and less aggressive.
3. Audi S4 Door Blades – the most aggressive of the three, these door blades stick out the furthest from the body and have the sharpest angles.

To install or swap door blades from one style to the other is very easy – all you need is a phillips screw driver, and you can swap out all four in under 20 minutes. There are two screws on the bottom of the door, which is all you need to remove, and then the door blade slides out. Here are a few pictures & step by step instructions on how to install & swap out a door blade (it is the same for all four doors). 

Installation Guide

Step 1 – Remove the two screws on the bottom of the inside of the door. One is on the outside edge, one on the inside edge. 

And here is the other screw:

Step 2 – Slide out the door blade. The door blades slide in and out, so simply pull the door blade outward away from the car when the door is open and it should slide 4-5 inches and the fall off. 

Step 3 – Slide on the new door blade and insert & tighten both screws again (basically, steps 1 & 2 in reverse). You’re done! 

Installation is easy and there is no doubt the door blades add an awesome visual effect to the car, whether you’re going for a clean & stealthy look with the flat door blades off of a standard A4, or a super aggressive and sporty look with door blades from an Audi A4. 

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