After you rearrange the pipes, the entire system should look roughly like the following pictures:
You can assemble the whole system outside of the car using the fittings and the filter. It should look like the following pictures

The AEM air filter and it's orange fitting was used during the prototype
process...)
Once the system looks like the pictures, and you have test fitted everything, it’s time to finish the job.
THIS NEXT STEP IS VERY IMPORTANT!!!
This step involves making the crankcase vent that goes from the intake system to the valve cover (i.e. crankcase). You need to do this part – it cannot be left out! Anyways, all you will be doing is drilling a 3/8" hole into the upper (i.e. first) intake pipe. Look at the stock piece (and also the pictures) to see about where the hose needs to go:
It will be easiest to start with a small drill bit and move up to 3/8". Make sure you make the hole facing the valve cover connection! Once you have drilled the 3/8" hole, insert the 3/8" rubber grommet. Then cut a 3" or so piece of the milky white 3/8" OD plastic tube, and insert it into the grommet. Make SURE it is a very tight fit, basically airtight. It might even be so tight that you need to lubricate the tube to insert it into the grommet. Insert the tube so that about 1" is inside the pipe itself, and 2" is outside of the pipe. Once the tube is in the pipe, attach the 5/8" OD (3/8" ID) tube OVER the milky white plastic tube, and attach the other end to the vent on the valve cover. You may need
to shorten the length of tubing to fit. Make sure it’s not stretched too tight, but not too much slack either. Also, make sure the tubing isn’t kinked - this will restrict arflow.
See the following drawing for what the complete system should look like:
Once the tubing system is complete, remove the tubing pieces and the grommet.
* Note: If you are making this system for an OBD-II car (i.e. 1996+), you will need to make a place for the intake air temperature sensor. See the additional notes section at the
end of the article for more information before continuing!
You're almost done...the next step is to paint the system.
Get everything cleaned up again using soap and water, or a good engine degreaser or cleaner. Finally, rub it all down with isopropyl alcohol to remove any hand and finger oil. Once you have done so, it’s time to paint the system. This is a VERY important step.
Why? Well, the piping is made of plain mild steel, which rusts. The good news is that this piping has been aluminized because it was originally designed for use as exhaust piping. This is to our advantage, because the aluminization will help fight off rust caused by rain moisture and winter salt. However, the edges are exposed steel, and will rust. Also, the ceramic-based paint will help block most of the underhood engine heat, and painting the inside of the pipe will help to smooth the interior. This will speed up the airflow which is a good thing.
YOU WILL BE PAINTING THE INSIDE AND THE OUTSIDE OF THE
PIPING!!!
Paint the inside of the piping first, using light coats. You will have to be creative here, and shoot the inside of the pipe from both ends to ensure the entire inside of the pipe is covered with paint. Make sure you keep moving the can, and don’t spray too heavily, which will cause BAD paint runs and also reduce the overall inside diameter of the piping. I painted the inside of my system with a total of about 3 light coats of white.
Let it dry for a few hours, and come back and reclean the outside of the pipe with the isopropyl alcohol to remove any hand or finger oils. Then carefully paint the outside of the pipe using light coats. You will have to flip the pieces over to make sure you cover
the entire pipe, or you can just suspend the pipe from a piece of string (allowing you to paint the entire piece of piece at once without flipping it over to do the other side.) I used about 4 coats of paint on the outside.
You will be able to handle the pipe after a few hours or drying, but I would HIGHLY recommend even letting the paint dry overnight, as it takes some time to cure. Follow the instructions on the can of paint for the exact details.
Once the system is completely dry, it time to finish up. You will start by CLEANING THE INSIDE OF THE PIPING!!! Anything inside of the piping (i.e. dust, metal shavings, loose paint, etc.) will get SUCKED RIGHT INTO YOUR ENGINE when you start the car! This is BAD if you didn’t guess. The easiest way to do it is to run a medium sized towel into the pipe, and pull it through the other end. The towel will pull any loose particles with it and leave the inside of the pipe clean and ready to go.
Once the piping has been cleaned out, reinstall the grommets and insert the milky white 3/8" OD plastic tube. Then assemble the intake system and install it. I had to install the upper two pieces first, and then bolt the third piece and filter on from underneath the bumper opening. See picture:
(The filter used here is a "funnel ram filter" used during the prototype process...)
Hang on, you’re almost done!! The completed system should look like this picture:
(The filter used here is the AEM filter again used during the prototype process...)
If your system looks like the picture above, you did it right! If not, you must have missed a few steps
Don’t forget to hook up the vinyl tube that goes from the intake pipe to the valve cover vent!!
Finally, put your bumper back on, clean up, and go out for a test drive! You should feel a SIGNIFICANT difference in power across the entire power band.
ADDITIONAL NOTES:
The procedure above applies to OBD-I cars. Starting in 1996, Honda added a second intake air temperature sensor in the upper intake tube for OBD-II. So if you are making this system for a 1996+ car, all you need to do is buy an additional grommet ( I don't know the exact size so you'll have to look) and drill a second hole in the intake tube for the intake temperature sensor. Look on the stock rubber tube to see where the sensor is
located, and drill the hole in roughly the same spot. Then just insert the grommet + intake temperature sensor and secure everything and you're done!
The intake piping listed is 2.5". For larger motors (Type R, H-series motors, and even non-intercooled turbo cars), you can use 3" piping. It's also available from J.C. Whitney and runs $21.98. Order part number "81EH3036T" instead of the one I originally listed above if you want 3" piping instead. I would not recommend using the 3" piping on smaller motors (like 1.5 and 1.6L etc.) because you will lose a lot of the low and mid-range power that the AEM system was specifically designed for. Also note that if you use 3" piping you will have to make sure to get a K&N filter with a 3" opening (i.e. the AEM filter will <U>not</U> work).
This intake system was designed and prototyped on a 94 delSol VTEC. Depending on the car you are trying to make the system for, it may not work at all. Some throttle bodies are located lower or higher than mine or even orientieted in a different direction!
So just because it worked for my motor doesn't mean it will work for yours. One tip would be to look at the AEM system for your car - if it does not roughly resemble my system, then these directions probably won't work. It will then be your full responsibility to use these directions as a Guideline to customize your own!
There has been some concern about the steel piping used. The main object of this How2 was to make a system that outperformed the mighty AEM for 1/4 the cost. You can use aluminum if you want - finding the U-bend piece might be the problem (it will also cost more). If you can find aluminum, make sure it has the same u-bend dimensions as the J.C. Whitney piping, otherwise the length and bend angles won't work out the same. The dimensions you need for the 2.5" piping are 18" minimum leg length, 5" radius, and a 180 degree bend. The dimensions for the 3" piping are 18" minimum leg length and 6"
radius. The bend on both pipes is 180 degrees obviously. (The J.C Whitney piping has a 24" leg length, but there is leftover piping that you do not use).
DO NOT</U> use PVC pipe to make the intake piping. PCV piping is not heat tolerant and will melt and release toxic fumes when exposed to under hood temperatures. Plus the ID of PVC piping is much smaller than 2.5" because it is very thick. The Iceman systems are made of thermoplastic, which is a special plastic formulated to take heat. PVC piping is not so please do not use it.
On the crankcase breather tube, you do not have to use plastic tubing. You can use a piece of 3/8" metal tube instead and have it welded (or JB Weld it) if you want. I just chose plastic tuning because it's the easiest and cheapest and doesn't involve
welding.
... to be continued (last time)