I believe it was BamZipPow, but the pictures on his thread are down. Someone made a channel like I think you are talking about. It just seals the gaps between the front of the car and the radiator so that no air escapes around it.
Also if you haven't seen it already:
File:KorffIntakeDuct.jpg - EcoModder
BTW you should consider adding yourself to the ecomodder user map if you haven't already.
https://www.zeemaps.com/map?group=1047848
Good luck
__________________
1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
1981 Kawasaki KZ750E
1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
1995 Chevy Astro RWD (current project)
1995 Mercury Tracer
2017 Kawasaki VersysX 300
2022 Corolla Hatchback 6MT
https://www.youtube.com/channel/UC6s...LulDUQ8HMj5VKA