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The block off plate is to prevent your intake from sucking in hot air from the engine bay. You can make your own very easily as shown below.


Mugen block off plate (for reference)


mugen air duct


As far as the air duct vs. cutting the bumper vent, they accomplish the same goal of providing cold air to the intake. As you can imagine the closer the velocity stack is to the opening, the more dirt/water you are likely to take into the system. If you open the vents in the bumper piece, the more air flow you will have but you also increase chance of dirt/water entering the intake. The mugen vent allows you to have a vent without cutting the bumper insert.

Another member (ekjose) who has moved the trumpet as close to the opening as possible and opened all the vents.



My intake setup is somewhere in the middle. I made a homemade block off plate to prevent intake from breathing the hot engine bay air. My intake piping is not quite as close to the bumper opening as the one above and I have opened only the top two vents in the black bumper insert. This way I get the benefits of the open vent but less exposure to dirt/water. (The piping is from from pep boys for $40.)


CT icebox (for reference)
 

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The block off plate in the pic is part of the J's racing intake. I saw it and I thought it was a good idea that I could make myself. It just blocks the opening between the engine bay and intake. It probably won't make much of a difference on the CT as the CT draws air from in front of this opening. The Mugen is more likely to draw in air from this opening as it is closer to this opening than the front vent.

opening without block off


after block off plate


J's racing intake - http://www.tsxclub.com/forums/aj-racing/19378-js-racing-intake-updated-cf-intake.html



Comptech Intake Replica - http://www.tsxclub.com/forums/1st-gen-engine/22635-comptech-replica-intake-under-75-bucks.html
 

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Hi Dinoc,
I think either one of those pieces should work just fine. If I recall the opening is about 6" x 8" (or 15cm x 25cm). Take some pics and measurements if possible.
:mardi:
 

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I have the top two vents cut open on my car and I have not had any issues.

If you are really concerned about water, another alternative is not completely remove the back wall of each vent but rather cleanly cut the bottom and sides of each vent and angle the back wall downward to direct water downward. I'm sure this would result in almost the same amount of fresh air entering the chamber behind the bumper, but less chance of water entering the velocity stack.



(It would look like this louvered vent from the inside)
 

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I have the top two vents cut open on my car and I have not had any issues.

If you are really concerned about water, another alternative is not to completely remove the back wall of each vent but rather cleanly cut the bottom and sides of each back wall and angle them downward to direct water downward. I'm sure this would result in almost the same amount of fresh air entering the chamber behind the bumper, but less chance of water entering the velocity stack.



(It would look like this louvered vent from the inside)
 
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