[oldeguy]

I just had an intake install last week. I'm not sure if it would make a difference, I have a Zetec engine, and the battery wasn't disconnected during the install, and there wasn't a problem, other than a lot more sound coming from the engine, better low end torque, and a better feel to the car. Your gas mileage will go down, because you'll like the sound of your engine as it accelerates. If you disconnect the battery, you'll have to go through the procedure of the computer relearning the way to work. Personally, I'd not disconnect it, and see how it drives. If it lousy, then, disconnect the battery for a bit.