I read about the Pro Force exhaust and listened to the sound clip and ordered a set (thanks Miguel at RMJ Motorsports!). They arrived yesterday and I couldn't wait so installed them this afternoon. I have a 2007 DC 4x4. The installation was simple - I did it in my drive way with my hand tools in just under an hour and a half. There is plenty of room under the truck to install the exhaust.
Started it up and the sound was perfect! The stock Tundra is so quiet. I did not want LOUD, but wanted something - and now I have just what I was looking for. The truck has a nice mellow sound. And those two large tips look fantastic.
Took it out for a short ride and no drone that I could find. I have nothing to measure it against but my seat of the pants impression is that I have slightly better acceleration.
Once it cools down I will go out and re-tighten everything.
My only complaint is that freight to Hawaii is too expensive (but that is Fed Ex's fault).
