Yup, had it for about a year and liked it for the first few months, then the drone got a bit annoying. Inside the cabin it sounded more like a vacuum cleaner and didn't have the sound I was looking for outside the truck. The Doug Thorley system is definitely louder; not audaciously loud, but my friends could tell a difference. For me it's worth it because I love the exhaust note, and in-cabin noise doesn't seem to be that much more than the Borla system. Yes, you can detect every single change in throttle as well, and if things are not clamped down underneath you're gonna get some reverberation which can be annoying to find (mine was my cat-shields and an interior quarter panel panel), but I still get smile on my face as I pull into traffic.
I feel the engine spools up easier but let's be serious, these are heavy pigs which were never meant for a run at Leguna Seca. All-in-all, I feel there's a bit more get up and go, but that could just be the psychological effect of hearing more noise; fuel economy is just the same as well.
Here's my exhaust comparo clip I did the day I had the Doug Thorley system installed (not under load, just in neutral). Be sure to listen to it with good headphones or speakers!:
Acceleration from inside the cabin. In my case, there's more tire noise especially at cruising speed. On the highway the exhaust note practically undetectable, so if you already have all-terrains, then it shouldn't be a problem:
