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Thank you for the picture ! Looks like the Saleen grill I'm looking at may provide a good airflow w/o mod and it's cheaper at a little over half. I'm also waiting for Agent 47 to come up with theirs. I like the way they do their '5 grill.
The cutouts around and above the pony emblem is the way the 302S grille comes delivered. As for the cuts I did on the left and right sides, I used a 1.5" Dremel metal cutting blade at a speed of 15. Too slow and it won't cut well and too fast and it melts the plastic too easily. I did not cut vertically into the back of the grille, I cut horizontally at about a depth of 3/16 of an inch, just a little more than the thickness of the plastic. Start with the smallest vent hole and work your way up. The smallest one is the easiest and there's room for the cuting blade. As you cut sections you gain room to cut the others. The 1.5" blades are ALMOST wide enough to cut totally across an individual section but not fully. I completed cuts on 3 sides and on the 4'th adjacent siide just cut enough to flip the plastic up that I was cutting off for each section (it gets hot, I used a small flathead screwdriver). After I flipped up a section I then finished the cut on that section - flipping it up gives you full access to the last cut of that section. The most important thing is to try to stay as level as you can at all times. After the initial cuts it looks a little ugly becuase there a good amount of melted plastic near and inside the hole. But all that cleans up very easily with an Exacto knife, the newly melted plastic is very brittle vs. the plastic not melted/cut. If you don't make the cuts perfectly level you will probably not be able to tell from the front once it's mounted. Cleaning up each section on the inside of each hole vent is what makes it look proper from the front.
I have this one there now. It was not the greatest but something I threw together quickly one day. I have no problem moving this but I would rather have people add to the one that is there with better pics maybe?