Originally Posted by 1st

MAF tubes = Mass Air Flow tubes. They basically replace the black accordion tubes that are stock on the intake boxes. Found here http://www.z1motorsports.com/g37_370...oducts_id=5292
I guess they offer smooth flow without the turbulence and you would swap out the oem filters in the oem air boxes with the K&N drop-ins instead. Believe it or not but the oem intakes are up to par. If your seeking performance and gains Stillen G3’s are the way to go. This whole intake thing though is like talking oil. But like others have stated Oem, MAF Tubes with drop-in’s or G3. These are the best options.