Its function is to house the Mass Air flow sensor. If you look towards the background of the pic you will see the MAF sensor protruding out. It is approx. 4 inches in length, many are made in Alluminum, mine is manufactured by PowerMAF made of some kind of plastic. It does extend the overall length of the intake system by 4 inches. The slot style Ls7 MAF sensor does include Intake air temp sensor as well, funny thing is I spent time trying to locate the sensor in the correct spot to avoid air turbulence problems and we ended up tuning the engine in a speed density mode which doesn't even use the darn MAF.
Hope this helps.
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