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Do they work?
Lol, must say, I had them on my 135i mainly for aesthetic purposes since I had a red interior. Of course I was curious if they would provide any benefit or not.
On the 135i, I felt it was pointless, as the air was already channeled nicely into the intake, forced by the twin turbos. I really don't think I felt a noticeable difference.
There are a few independent dyno graphs from the skeptics of these products, however, it is on an N/A V10 M5 and V8 M3, claims ranging from 4-14hp.
Seems they are effective at higher speeds to channel air for N/A engines.
Yet to see any hp+ claims with dyno for turbo charged cars.
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