I second on the Poison Spyder hood vent... Few tips that worked for me...
1. Remove the cowl then unbolt the hood from inside (so you don't mess up the paint on the hinges).
2. Use painters tape to tape the hood and then put the template on top of that, will help for paint chipping and protect against scratching when you cut).
3. One I didn't do: try to add something to protect the re-enforcement under the hood when you cut... Or make many, many light cuts... I drew the re-enforcement on the painters tape so I had an idea where it was... But I still made a few tiny cuts in the re-enforcement when I cut the hood (activating).
4. On the re-enforcement you use a hole saw to cut into it where the vent bolts are in some areas... But not in a few spots... Make extra sure you put those on barely tight, or it will dimple the hood! If you do demote the hood, I bet you could use the hole saw and open it up to add a washer, which would flatten it out (guessing).
Any way that's my two cents (this is an awesome site, I am sure lots of other folks will chime in).