Do you people seriously think that a 2 buck part will improve anything??? If it did, don't you think that BMW would put it on, if it improved things. I am skeptical, obviously. Manufactures spend millions on developement, you spend 50 bucks.....who are we kidding. I believe the drag "cost" of swirling the air out strips any vortex advantage in modern engines.

I tried one on a diesel toyota a few years ago and had it dyno tested.

The results were; less power, rough power delivery through parts of the rev range and a noticable decline in revs at the top end.

I got my money back!

Mat
3.0d sp