Thanks for the update. I'll be checking for your comments on the highway results.Good news! Power flo's came in today! Took about 45 mins to get em installed, and now it sounds great! Not overly loud like the flowmasters on my truck. These just have a really deep tone. They don't really get much louder when you hit the gas. Maybe just a bit louder, but it's not bad at all! I was concerned that it would be too loud, since this is the wife's car and she doesn't want that, but she likes is alot. I haven't gotten it on the highway yet. It started to snow here right when I got home today, and the roads are slick. Making a trip to Bowling Green, Ky on Saturday for a paintball tournament, so I will get a chance to check out the resonance issue. So far, I am impressed.