The purpose of this mod is to bypass the area of the stock tube where airflow turbulence is the greatest. This is the part of the intake tube (it looks like an accordion) that meets the MAF tube.
Go to your friendly Home Depot and get a 4" aluminum duct connector for 2-3 bucks and electrical or masking tape will do.
The part looks like this..

 

Unsnap the rivets from the aluminum duct and form it to have the same diameter as the MAF tube..

 

Use the tape to prevent it from becoming undone. Mark a spots to drill 3 holes. Then I popriveted it back. Make sure to align the rivets with the MAF sensor when you position the aluminum duct with the MAF tube. This will minimize any more turbulence..

 

Pls show what it looks like installed.

 

Lastly, tape it in place with the MAF tube and carefully insert in the intake tube. The aluminum duct is paper thin so there is no restriction at all. This will decrease turbulence and improve airflow.
Again, don't ask me about hp gain cause I don't know. This mod cost a few bucks so if you're not impress by it, toss it. I think my car runs so much smoother with it.
Enjoy..

 

That's sealed right?

 

Yes, no air leak.

 

I have a realllllllly hard time believe that the masking tape is the best "sealer" for this application. Any problems with it coming loose or pealing off??

 

Good idea, but that looks horrible. Looks like some intake mod out of some riceboys Civic...your degrading the underhood look of your car imo

 

I think he still covers the whole thing up with the stock tube. The sleeve just takes the air past the accordion part giving it smooth flow. Meaning once it is completely installed you wont know its there.

I really like your idea . . . that accordion thing is the only reason I am using the Injen upper tube (well it looks good too). Let me know how this goes, I want to use my stock plastic piece as the injen piece gets too hot (even after I powdercoated it).

 

Just an FYI. Maxima guys who have done a similiar modification experienced greater rates of MAF failure do to increased engine vibration transferred to the MAF. I'm not sure if Nissan came out with a better MAF for you Z guys but I just wanted to give you a heads up.

 

Wouldn't it make more sense to make the aluminum tube go over the MAF and have it held in place by the clamp on the "accordion" tube? I would be worried about the tape drying out because of the heat and then coming loose and getting sucked in the engine.

 

Nice idea, let us know how it works out.

 

That is correct Vandy Z. You wont know its there until you take the MAF tube out. As far as the tape is concern, it hasn't come undone since I put it on last December. I usually retape it everytime I check for good measures.

 

if you put some silicone along the crack you don't have to worry about retaping or it coming off, just a suggestion.

 

what about using some plastic tubing instead....to keep the heat absorbtion down as well as a smoother air flow (no rivets)....and using clamps to connect the pieces together

 

Yes, very thin plastic might work. It seems that the new tube should not be touching the MAF due to transmitting vibrations to it and then causing failure. Maybe a thin wall rubber tube would be better.

 

Plastic would be ideal but you can't find a thin enough plastic or rubber with the same rigidity as aluminum. If you go with thicker walled plastic then you risk adding restriction. That would create even more turbulence thus affecting flow.
The aluminum duct sits about 2-3mm at the lip of the MAF tube, about .75 - 1" away from the MAF sensor. If you look at the MAF tube closely, the inside diameter tapers outward, meaning it's thicker from the inside and progressively thinner at the lip. If the aluminum duct's diameter is the same as the MAF"S tube outer lip diameter, you wont be able to push it in much further without considerable force. It 's on very tight plus the tape of maybe some silicone like some one suggested will just 'bout lock it in place.

 

Nice idea...

Ugly tho...doesn't belong on a 30k sports car...but a start for sure. You should try and get in touch with a group who can produce something more porfessional...

 

i see you changed your answer.

not sure if you read the thread or looked carefully....but...the accordian like tube goes OVER the aluminum piece. you won't see any of it when done.

man...why doesn't anyone read????