I made a cold air intake by cutting a hole in my rain tray and pop-riveting a 2.5" NACA duct to it. My plan is to cut the snorkel back to where it widens to 2.5" and connect it with a piece of neoprene brake ducting.

I'll post pictures when it's done, still have to actually order the brake ducting.

My question is, will the fuel mixture or anything else need to be adjusted?

Only if you drive in the rain....

--DD

Not planning on driving in the rain, but disconnecting it will be the #1 to-do item before washing the car