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Tony A Ram Air instructions (CTS)Thanks to RobertCTS
Click the images to make them larger
I ordered my Fram AirHog online from Advanced Auto Parts for about $40. Part Number PPA7597
You could stop here and bolt it back up in the car and see some improvement.
Hang onto that box when you drill because when you first start it will want to jump out of your hands!!
This is to balance additional air for the 3" new hole you cut.
The picture shows a lot more holes but you only need 35 to equal the area of the newly cut 3" hole. Clean up is a mess
Aligning the newly cut hole in the airbox to where you cut your hole in the flexible material is tricky.
I suggest cutting it oversize to cover your bases.
This lets fresh air into that air chamber instead of under the car.
Good luck! Let me know how it goes. If you find details missing let me know so I can update the instructions