Did not see a reason to drill a hole. The two front air ways have restrictors in them. I just knocked them out and the factory holes are now bigger. Now just need that 02 manipulator to show up. The 28 mile ride to work today I could tell she was running I guess around 5 degrees hotter........No doubt it is leaner 192-194 degrees going to work but 184 coming home at night cooler. Everything else is stock.