Project E39 M5, Installing the Dinan Cold Air Intake

We think that the Dinan intake will be even more effective with the smooth-flowing HPS intake tubes.

Next, the air filters are installed, this is the passenger side with the air guide, air-water separator, and the air pump relocation bracket in place.

The driver’s side intake with the air guide and air-water separator.

We re-used these rubber vibration isolator mounts for the intake tube brackets.  These were factory parts leftover from the air pump relocation and we found that they actually put the intake tubes in a better position where they would be less likely to rub on things.

To get a good supply of cold air, the stock  BMW fog light surrounds (pictured on top) were replaced with these Dinan parts that were minus the block-off flap of the OEM part (shown on the bottom).


  1. Schrick cams and a lightweight flywheel, please. VAC Motorsports has both. They really transform the car.

    1. My experience with rwd & light flywheel, it’s most nticeable in only 1st gear, when revs build up quickly .. it’s less rotary inertia at engine speed accelleration. I found I would spin the tires more easily at take off. It may improve heal-toe shifting, depends on several other things like throttle response. Good cam up grades are winners, have done a few.

  2. Great install write up.

    It looks to be very well made, but based on the Dinan site, not sure it’s worth the trouble and expense.

    “More Power: + 5 HP @ 7000 RPM, + 4 LB-FT @ 7000 RPM (coupled w/ engine software).”

    A BMW M5 is likely to have a good intake already.

    1. We noted that the stock intake was a pretty good design. The biggest part of the equation could be relocating the intake air temp sensor as power drop due to the sensor getting hot is a pretty big deal on these cars.

      1. Out of curiosity, I would measure the air temp entering the manifold , vs at the MAF sensor, after heat soak. If the same, the hot retarded timing may be justifed for engine health?

  3. Did we ever compare these to the stock intakes
    On the dyno? I have the same set up with headers debating adding these.

Leave a Reply

Your email address will not be published. Required fields are marked *