Product Reviews

034 Motorsport MAF Hose – B6/B7 Audi S4

034 MAF Hose (L) versus OEM (R)
034 MAF Hose (L) versus OEM (R)

I recently installed the 034 MAF hose on my B7 Audi S4 while I was replacing the air filter with a K&N and thought I’d share installation photos/instructions here since I couldn’t find much on the internet. It’s a very simple install and takes about 10 minutes. The only tool you need is a flathead screwdriver, and some pliers (pliers optional). I purchased the hose from JHM here. The manufacturer states that this product is an improvement over OEM based on:

Advantages are: smoother and larger ID for better flow than stock (OEM is necked down to 82mm inside, this silicone hose is 88mm throughout).Made from 4-ply reinforced silicone, features smooth inner bore for maximum flow, good looks and longevity.

You can see in the picture above that it is definitely smoother, and looking down the pipes you can tell the inner diameter is also larger. While I don’t notice any dramatic difference on the “butt dyno”, I think this mod is well worth the $70 if you’re trying to improve airflow into the engine. I had a similar hose on my A4 (034 Turbo Inlet Hose) and also had a good experience with that, which is another reason why I wanted to try out this hose.

Installation Instructions:

034 MAF Hose Install - Step 1

Step 1 – remove the engine cover. It pops right off, no tools necessary.

034 MAF Hose Install - Step 2A

034 MAF Hose Install - Step 2B

Step 2 – Loosen both hose clamps so that the OEM pipe can be taken off. You will reuse the hose clamps so do not discard them.

034 MAF Hose Install - Step 3

Step 3 – Remove the plastic nozzle/sensor from the OEM tube. It will pull out using your hands or a pair of pliers. Be very gentle as you don’t want to break anything, and in my experience the plastic in the engine bay can be very brittle (and expensive to replace!).

034 MAF Hose Install - Step 4

Step 4 – Remove the OEM hose and insert the silicone 034 MAF hose with the OEM hose clamps over each end. Insert the plastic nozzle in the factory hole, and then tighten each hose clamp again. Make sure the hose clamps are on the far end of each side of the hose so it is tightening down where the hose overlaps with the respective connecting parts.

034 MAF Hose Installed

Step 5 – Replace the engine cover, test all fittings and enjoy!



Nick Roshon

Nick has been an Audi owner and fanatic for the last 10 years, and started Nick's Car Blog in 2009 to share DIYs and pictures of his A4. Currently he drives a 2012 Audi TT-RS, and has previously owned a B7 S4, B7 A4, and an 82 Audi Coupe (GT) LeMons race car. In his day job, Nick is a digital marketer and lives in San Diego, CA, USA.


  1. I have always wondered what the gains were on the JHM but have you had any information on the REVO for the B7 S4. I know you have moved on with this car but any knowledge on the REVO tune. I am at a cross road on which direction to go with my tune.

    2007 – B7 S4 Avant 6MT
    JHM light weight pulley
    JHM light weight mass flywheel
    JHM R series racing cluch
    034 transmission and motor mounts

  2. Hi Tam – I’m not too familiar with the REVO tune. People tend to like them, but IMO JHM is far more focused on the 4.2 V8 found in the S4 and is actively updating their tune to ensure best performance. Since you already have a bunch of JHM parts anyway, I’d stick with that.

  3. Did you happen to notice any noise change with the K and N filter and the larger hose? I’m still stock and you can definitely hear the 40 valve wants air, sounds almost like a straw lol.

Leave a Reply

Back to top button