2007 FJ Cruiser
Doesn't sound like a BB Chevrolet, but it does not sound like a stock exhaust either. Nice little rumble. It seems to have a slight more power. I don't know if it will increase gas mileage because I just installed it. I didn't install it for the gas mileage, but for the sound and appearance. Both of those are excellent.
Sounds GREAT! Install took modification, not so great.
My wife bought this as a Christmas gift. She ordered the correct type for the make and model of my Tundra. I took it to have it professionally installed, as I don't have the proper equipment to install myself. I'm so glad I did! The system came with NO gaskets and the clamps didn't fit! Also, the hanger on the left side had to be cut and welded to fit correctly. What should have taken 1 hour to install ended up taking 3.