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					Originally Posted by The Radium King  996 is 3.25" ID, no? and, from what i recall about your install, your maf housing is located right after a bend? | 
	
 
pretty sure the 996 is 3.5".  
MAF sensor should be at least 1 and ideally 1.5 pipe diameters from a bend.  in this case, that would be 3.50" - 5.25".  i am at the upper end of that range.
EDIT:  if you look at the 996 MAF housing, the inlet is a funky shape and VERY close to the airbox itself.  probably not a comparable measurement environment to the one below.