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      04-03-2013, 11:17 AM   #13
Papethova
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Drives: '08 135/ '11 1M
Join Date: Oct 2007
Location: at Death Valley 127

iTrader: (1)

I trimmed the lower portion of the shroud. If you dont then you are blocking the lower part of the core (basically whatever frontal area that is larger than OEM).

I left the top and the sides of the shroud on so air is forced through the core. I feel removing the part (shroud) completely will give air an easier route around the core. Air will flow and take the route of least resistance.

By maximizing the surface area and forcing the air through the core I feel you can get the maximum results out of the unit/upgrade.

You can always buy a new shroud and replace the one you cut if you want to reverse the mod or go back to the OEM look. Honestly you cant even tell it was cut or altered unless you specifically look for it.
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