GU 4.2 turbo airbox modification donaldson cobra head conversion
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Pic 2 - I'm committed, basically I've just used a concrete cutting disc in a 5" grinder. Safety note, dont use gloves on rotating equipment and do not remove the guarding
Pic 3a & 3b - Here is the custom through fitting I'm using Its just a piece of stainless 3" pipe tigged into some stainless plate. The other blank plate is the keeper plate for the top of the lid. The studs are tapped and threaded in then tig welded in place. The whole face is then sanded on a flapper wheel (bench grinder) The other pic is of the donaldson cobrahead with the reducer in the end of it to mate it up to the existing nissan intake
Pic 4 - The installed through fitting. You have to grind out the inside of the airbox as there is some protruding plastic pipe. The top of the lid also has to be ground flush to accommodate the keeper plate. Once all the prep work is done, I used sika to seal all of it up, make sure you have fresh rags on hand to clean up the spillage as you tighten the nuts down.
Pic 5 - The inside of the airbox with fitting installed. The diameter of these are so that it fits snugly inside the airfilter so it will still seal against the actual lid
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