I just pulled my plugs the other day, to see what they look like, and up the gap to .030. Getting way more power now, and boost has gone up. I bought the car at 18,000 Km's, so it didn't really need touching but I figured I'd look anyways. It surprised me to find that all of the plugs came out at .020 gap, when that's a lot smaller than what even GM specs for the plugs. What happened there?