[Christ]

Intake temps don't normally affect engine temps directly (they do, obviously, but not as discernibly as you would expect.)

Tips for cutting that stuff you're working with - use an X-acto knife instead of scissors.

alternatively, you can cut it with heated wire, a-la foam cutting 101. Use respirator if you do this.

Cut out your basic shape first, but leave room between the basic shape and the actual line you wanted to cut. TRIM down to the line. You'll eventually get very efficient at this, and it's the best way to do it, since the excess material is there to account for textures you didn't take into consideration when mapping your surface.