I've had it done for a week and about 250 miles. So far, I don't hear any drone on the highway until about 80mph. Anything above that is a slight drone that you'll get with any system at that speed. Very minimal. There is also a slight drone going up hill that immediately goes away when the truck downshifts. If you leave the flapper (or both flappers if you have the 6.2 like me) it really helps cut down the highway noise. I was hesitant. But then I figured the worst thing that could happen is I hate it, buy a new muffler, and lose $75. I'm still way ahead over buying the whole catback. But I'm an accountant and cost saving is my life haha. I think it's worth a try for any owner looking to do an exhaust system. The risk is minimal but the reward is great if you like it. Here are some samples from my truck: