I had these filters custom made to fit perfectly in the stock box. They clamp on nicely to the odd sized opening used on the factory CAI. Blue with the inverted cone tip for higher flow. Introductory price of only $59+shipping. I have about 100 in stock.
VMP Tuning - Buy Ford SCT & GM Custom Handheld Flash Tuners Performance Economy Towing: High-Flow Air Filter for 10-12 GT500 Factory CAI
For the 07-09 guys running the VMP or FRPP 113MM CAI, I have filters for you too:
VMP Tuning - Buy Ford SCT & GM Custom Handheld Flash Tuners Performance Economy Towing: Replacement Filter for Ford Racing 113MM or 90MM CAI
VMP Tuning - Buy Ford SCT & GM Custom Handheld Flash Tuners Performance Economy Towing: High-Flow Air Filter for 10-12 GT500 Factory CAI
For the 07-09 guys running the VMP or FRPP 113MM CAI, I have filters for you too:
VMP Tuning - Buy Ford SCT & GM Custom Handheld Flash Tuners Performance Economy Towing: Replacement Filter for Ford Racing 113MM or 90MM CAI