I would have to agree with intake for the MTX and a cooler for the ATX.
As for the intake;
The CTA intake, while a nice kit, is not optimal.
And it is fairly pricey.
Search around and you'll find some alternatives.
My contribution can be searched for under "proper intake setup".
And other people have come up with their own or used ones meant for the Focus.
An intake wshould not hurt gas mileage,
because you are removing the restictive sound control tubing,
so it is easier for the engine to breathe.
