I got my truck straight piped about 4 months ago and I wasn't quite sure how it would sound on a 4.8. It was pretty annoying especially since I had it turned down before the rear axle which made the drone 3 times worse. I'm going on vacation next week and I knew listening to that drone for 8 hours was gonna drive me crazy. I stopped by my local exhaust shop and asked if I wanted to try a magnaflow. I was a little hesitant about it, but I went with it anyway. I knew flowmaster had some amount of drone. I love it, it has a nice some what loud rumble without any drone. I was suprised by the lack of drone it has compared to the flowmaster. It has a perfect tone for my 4.8 chevy and I couldn't be happier. I believe it is either the 12288 or the 12588 not quite sure, but it is definitely worth it for anyone who is unsure which muffler to go with.