Every bit helps.
But if you really want to feel the effects of aerodynamics at the track, you'll need to run one of those Race GT-style wings, preferably double-foils.
All street "wings" are for looks only, and some actually increase lift at the back.
I used to not like any add-ons on the Bimmers, but after looking more at the M3 (and especially the CSL) lips and after installing one on my car, I grew to really like it. The profile become aggressive without breaking the lines.
![Smile [:)] [:)]](/images/smilies/smile.png)
All street "wings" are for looks only, and some actually increase lift at the back.
![Paranoid [paranoid] [paranoid]](/images/smilies/icon_smile_paranoid.gif)
I used to not like any add-ons on the Bimmers, but after looking more at the M3 (and especially the CSL) lips and after installing one on my car, I grew to really like it. The profile become aggressive without breaking the lines.