After receiving the Dinan snorkel, I looked over the instructions. They looked very sparse and included no pictures and only one diagram.
As recommended, I read through the instruction before starting, and still could not glean what it was supposed to doing – even though I knew what the outcome was supposed to be.
The other part that was missing was a list of tools needed to complete the job. This is important with this install as the proper tools make it so much easier to complete the job in the small areas the snorkel fits in.
So, based on the provided instructions and a little help from the Baba, I was able to complete the job in a relatively short time – even though I had to take apart a good portion of my work to retrieve a wayward socket head.
Based on my experiences, I decided to write up some better instructions to eliminate some confusion I experienced, to input some tips that will eliminate the need for a second set of hands, and provide the much needed information left out of the Dinan documentation.
List of required tools:
Small socket wrench – recommend a small ¼ inch drive
Socket driver (screw driver type) – recommend a small one (¼ inch drive) with extension(s) to provide 6 inches or more of length
6, 8, 10, and 13mm socket heads
16mm open end wrench
Medium blade screwdriver
Small fine tooth saw
The instructions are oriented relative to you sitting behind the wheel of the car. Although you cannot install the snorkel sitting behind the seat of the car, this orientation is necessary.
As with the Dinan instruction, I suggest you at least read a number of steps ahead of any step so as to “visualize” the next instruction before you start.
Remove the two 10mm bolts holding the factory air box from the front of the left fender.
Release the clamps from the sides of the Air Mass Meter.
Remove the factory air box by pulling the airflow meter from the air box and pulling straight up and slightly on the air box. The air box intake is stuck in a space next to the headlight, so remove slowly so as not to tear the foam cushion around the intake.
Disconnect 2 power connectors from behind the headlight assembly. Unscrew the turn signal light connector and remove light from headlight assembly.
Locate the four 8mm screws holding the headlight assembly. Below or behind each is a headlight alignment bushing. In order to maintain proper headlight alignment, you must keep these bushings in place while removing the screws. The bushings are a 16mm hex with a slit in each side. If you have open end wrench that you can fit on the bushing, it is best. Otherwise, locate the slit on the bushing and use the screwdriver blade to lock the bushing in place while removing each of the screws holding the headlight assembly in place.
Disconnect the horn power connector and remove the horn and horn mounting bracket. You will need to relocate the horn and its bracket. However, it is much easier to get to the horn mounting bracket bolt if you first remove the horn from the bracket. Re-assemble horn on bracket once removed.
Remove the lower left (remember orientation) bumper shock nut and use this as the new horn mounting bracket attaching point. Tighten the nut only finger tight as you may have to adjust the horn position later.
Assemble the K&N filter, the air filter bracket, the filter support bracket, the support bracket screw clamps and screws, and the filter clamp as shown in the picture. Tighten the filter clamp only enough to hold the filter in place. Place the screw clamps on the support bracket so that the small holes of the clamps are towards the middle of the support bracket. Attach the support bracket to the filter bracket with the supplied screws, but do not tighten.
NOTE: Completely ignore the 2 holes in the air filter bracket. They are never used. I spent quite a time trying to figure where these attached.
Insert the filter assembly into the area just behind the fog light so that the bent part of the filter bracket mates with the lip on the frame rail and the curve of the air filter bracket fits to the contour of the curve of the wheel well.
Align the upper hole of the air filter support bracket with the bottom of the hole on the lip in front of the wheel well and attach in place with the second support bracket screw. Tighten both support bracket screws.
Align the lip of the bend part of the air filter bracket with the lip of the frame rail and attach with the 2 supplied clips.
Adjust the horn so that the power connector can be re-attached and re-attach the horn power connector. Tighten the nut holding the horn bracket in place.
Locate the mounting bracket on the left fenderwell below the airflow meter. If a hose is attached, remove the hose from the attaching clip and remove the clip from the mounting bracket.
Fit the airflow meter support bracket to the left side of the airflow meter. Align the holes at the bottom of the airflow meter support bracket with the bracket on the fenderwell and attach with supplied 6mm bolts.
Secure the airflow meter support bracket to the airflow meter with the long wire tie. Secure the hose formally attached to the mounting bracket to the airflow support bracket with the shorter wire tie.
Slip the #36 hose clamp on the reduced end of the silicone hose and slip the reduced end of the silicone hose to the airflow meter. Tighten the clamp.
While supporting the filter from the bottom, loosen the clamp around the air filter enough to fit the bottom end of the carbon fiber tube into the filter open enough so that the clamp will securely hold it. Fit the carbon fiber tube into the filter opening and retighten the clamp.
Slip the #48 hose clamp over the end of the silicone hose. Slip the end of the carbon filter tube well into the silicone hose and tighten the clamp to hold the tube in place.
Cut the headlight adjuster flang(es) as necessary to allow the headlight assembly to fit in the mounting area with clearance between the headlight adjuster and the carbon fiber tube.
Refit the headlight assembly into position and secure with mounting screws. Ensure the alignment bushings do not move when re-mounting the headlight.
Insert turn signal light into headlight assembly and secure. Re-attach headlight power connections.
Check all connections for tight fit
So, how is the new air snorkel? The extra air the 2.8 gets makes a big difference (particularly when coupled with the Dinan chip). The engine response better and the stock exhaust has a much better tone…particularly when above 3.5K rpm and under load (read, romping on the gas).
An upgraded intake is a definite plus to any Z3. However, at $399, the Dinan intake is a bit pricey for what you get. Particularly since the filter does not open to the outside air. There is probably a better way to make modifications to the existing intake to provide the extra air the engine craves. I have been considering a couple designs myself and plan on keeping the Dinan intake if just to have a comparison should I fabricate a different design myself.