Just wanted to check in and say what's up. My name is Justin and I just recently bought a 2005 grand prix GXP for my wife as her daily driver. Her suburban just wasn't cutting it in the MPG department. We've had it 3 days now and I've so far added a drop in K&N, HID lo beams, Mobil 1 synthetic, and 35% tint all the way arround.