Update
I have made up some covers to fit around the Fat shroud. The area it covers is behind (in front) of the fan pulley towards the rear apron, seperating the top from the bottom of the engine. Its like the tin on a type 1 where the hoses go through to the heater boxes.
The idea here was to stop the 911 fan from sucking in air past the BAS header, kind of like preheating the air before the fan inhaled it. This worked out great because I can't get the head temp (measured at #3 spark plug) to get past 325 deg when I really drive it hard.
Also my fan stays alot cleaner now becuase it isnt sucking in dusty air from under the car .. only clean air from behind the decklid now.
Alex suggested I put a bead of silicon between the gap in the shroud and the fan so with this and these plates it looks like I save 25 deg on my engine.
Sandeep
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