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Discussion Starter #1
As everyone knows, GM released a new air filter cover lid on the '02 Z06. The cover has a larger air inlet opening. This cover should fit the stock lower air filter housing as found on the '01 Corvette....so, if you desire increased air flow for your Vet, just buy GM air filter cover lid part number 25331177, and replace your original one! :cheers:

Hope this helps!

Zippy :z: :z:
 

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Zippy, I believe someone else posted yet another alternative.

The general idea as I recall is to remove the stock air box cover altogether, then tie wrap the "housing" with the filter still inside on both sides to the radiator shroud. This eliminates any restriction attributed to the stock "slotted" cover and probably saves a couple pounds as well.

To further reduce resistance to flow, one should probably replace the OEM filter element with a replacement such as made by K&N.

This is a "D-I-Y", low budget, air box modification but whether it does anything to add a little extra power I do not know. It may not be such a great idea when driving in rain or washing the car without a rubber sealing strip across the front of the hood to prevent water from dripping into the filter. I believe such a seal is available from Mid America for about $15.

Zippy, FWIW, I have also seen some people simply cut a wider notch in the '01 filter cover.
 

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Discussion Starter #4
Good idea, Tom!

Some may not want to cut thier original cover so they can re-install it when they sell the car...plus they keep their '02 cover for their next Vet.

Zip :z: :z:
 

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I added a 2002 lid

I think maybe I gained a couple HP. Also I removed the screen from my MAF. I probably would have gone with an after market set up, but I have to stay within the rules of the class I am going to reace in (SCCA T1).:cheers:
 

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cut the stock box

i just cout open my stock box on 02 and ran my personal best this weekend. [email protected] and a slew of 112.30's even getting a best mph of 116.87 on a 12.35 run. My best with donaldson was [email protected] I tried a custom setup that resembles the Haltech tric and ran 12.40's at 115+. I found my LT fuel trims were in the 10-14% with my custom setup and 14-19% with the donaldson wich threw codes all the time.
with the cut airbox my Lt fuel trimas are 3-6%. i really hink that you need to upgrade the injectors on the 02's if your going to increase the airflow into the motor.
 

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I can tell you from experience (did it last year) the K&N and modded air box cover really "wakes" up the car. West Coast Corvettes has one that seems to have a larger cut out than the 02 version I've seen, or yes, you can cut yours to size.:D

Had my car out this weekend in the 40F air, and it was strong as heck. Traction was definitely at a premium. With 28psi cold, the rear would "step out" with too much throttle. Man, it was fun!
:cool:
 

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I took the stock cover off my 01 and didn't notice a difference in seat of the pants. I then replaced the stock filter with a K & N, left the cover off (tiewrapped in place), flipped the box upside down, made a bracket to hold the filter up about 4"s so that the ram air is now completely functional. You can actually take a flashlight & shine the light thru the grill screen & with the hood open you will see the light has a clear shot into the filter. Flipping the box upside down solves the water problem. You do have to plug you breather hole & make a new one on the other side since flipping the box moves the hole. Definite improvement in performance & sound.:)
 

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FYI, Don't waste your money buying an 02 cover, by removing the cover completely you are exposing the total filter area for maximum air volume. If you want to laugh just remove your stock cover & look at the area of the filter that is dirty, it's about 1-1/2" wide. What a joke of a design. G.M. had to know they were leaving ponies on the table with that design.
 

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EDGZ06, interesting idea. Can you post a pic of your setup? What kind of brackets are needed to hold it up off the shroud?
Do they also anchor the box so that it does not lift any higher?
 

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dsinned,
I'll post some pics when my car comes back from the dealer (C4C5 specialist is rebuilding the tranny) hopefully Wednesday. I made the bracket out of a radio strap (1/2" straight bracket with holes). I bent the bracket into almost the shape of a slice of pie turned on it's side since the opening towards the front of the car is bigger. Once you flip the box over and lift it up a couple of inches you'll see what you have to work with. A couple of 2" angle brackets from Home Depot will work too
The goal is to lift the box as high as possible & still be able to close the hood. The bottom of the box (use to be the top) should be level with the bottom of the cross brace providing a clear passage from the screens up to the filter which is now facing down. I'll post some pics soon.
 

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EDGZ06 said:
FYI, Don't waste your money buying an 02 cover, by removing the cover completely you are exposing the total filter area for maximum air volume. If you want to laugh just remove your stock cover & look at the area of the filter that is dirty, it's about 1-1/2" wide. What a joke of a design. G.M. had to know they were leaving ponies on the table with that design.
Your idea of fliping the cover is very inovative, and I to look forward to seeing the pictures. I don't think it's a waste of money to get the 02 cover if you are interested in the weather protection it provides over an open filter. Maybe when you get your car back youl take a ride up to New England Dragway for some of the later oct MineShaft Air? Ric
 

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Ric, If you leave the filter facing up then you do need the cover because water will certainly enter the filter area from the front of the hood. But , if you flip the airbox over the filter is now upside down. water would then have to travel up to enter the filter & if that happens then it could still happen with the opening in the cover, just in a smaller area. Pics will definitely come, C4C5 just called me to let me know car will be ready tomorrow night. I'll be at Lebanon Valley on the 19th for the track rental if you want to go.
 
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