Yes well put...welcome to my world! I am wrestling with this right now. I have the 74 tb and plenum in place but I am trying to determine the real merits of the 987 box over making my own intake, sealed to the scoop of course. Making your own is much, much less hassle. I was suprised to see the Caymans making more power with the cone. Perhaps it is down to the filter element itself.
The main advantages of the 987 box are the huge intake area of the snorkels shaped to the scoop and box volume. There must be some hard to see restrictions inside the box. Actually this huge snorkel may be of use in making my own intake....running to the drawing board now!!
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Originally Posted by berty987
Not sure the 986 or 987 3.2 or 2.7 will benefit from the 82mm tb of the 997 carrera 3.8/gt3 . There was a guy that tried it over in australia and he thought it actually lost power. Fitting the 74mm unit with a silicone intake and cone filter is probably the best solution for a 986 , as removing the air box is much easier than on a 987. The 986 definitely has a stunted performance from the smaller air box and media area , hence the 986 550 anniversary gained power from simply fitting the 987airbox and filter but keeping the 68mm tb. The later 987. 3.2 and early 2.7 987 both used the 68mm tb from the 986. The later 987 M97 engine 3.4 and 2.7 used the larger 74mm throttle body. There is a thread running on planet-9.com relating to a cold air silicone hose and cone filter upgrade for the cayman that suggests significant gain over the 987 air box. This may be worth considering as an alternative to the hassle of buying and fitting the 987 air box to a 986. There may be issues with the maf housing diameter as the 987 uses a larger size and a different type of sensor I believe.
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