Trust me, you made the right swap. I was driving a 2007 Chrysler 300 SRT-8 with a cat-back that would drone like crazy on the highway. Now I'm cruising silently in my 2011 Volt and I love it. I've gone 2200 miles, and just recently had to put gas in it. I was going at least once a week in my Chrysler. I do miss certain driving aspects of the SRT-8. But I plan on getting a project to work on, hopefully a more track focused car that I don't have to worry about driving to work the next day.