I got one, took it off after a week. Just made noise more than anything. I lost some low end torque, and at the upper end all it did was make lots of noise. I don't see what's cool about your car roaring all loud when you get on it to merge etc, bu you are going just as fast as the quiet cars haha It would be one thing if all that noise was accompanied with noticeable power gains.

Maybe it's because of my autotragic, but I just didn't like it.

It did look good in the engine bay though