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My Ioniq has active grill shutters so no need for engine grill block. They stay closed when they can, and open when they want air flow in them. The front belly pan has a few squat holes in it, which I figured was for oil changes and getting to engine areas at first, but I think some of them are also for air flow too. I’ve always debated on patching up the belly pan holes for better aero, but don’t know how much of a diff it would make.
The hood of the underside of my Ioniq is pure aluminum. So I def need to add some insulation. I’m also an audiophile. I added some kilmat and second skin thermal jute on the floors in the front of the car, and sound deadened the whole trunk and spare tire area. I just need to do underfloor of back seats and also the doors. In the winter, I can feel the cold air radiating thru the plastic on the side of the doors. Was also going to do the roof liner with heat insulation too some day
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