Originally Posted by
SG1
Still not convinced it couldn work, a bore hone on a drill press or a round buffing/sanding of same size as MAF housing may work also, A lathe may struggle the more I think about it and possibly take a bit much of, look at the way the HPD maf housing is, it actually enlarges slightly around where the MAF sensor goes to slow down the speed of the air travelling past the MAF sensor, maybe even to much and as they state allows 30% more airflow through with out the MAF sensor sensing it, its just tricking the MAF sensor is all its doing, the standard MAF housing slightly reduces in size around where the MAF sensor goes to speed up the air flow past the maf, take away that and the air flow slows down, maf voltages are slightly lower, less limp mode. The thickness of the standards MAF housing shouldn be and issue as its not like your halving it or anything like that and no cracking of the housing should happen, maybe if you wanted it like the HPD you could let your your bore hone or round sanding/buffing do a few more rotations where the maf sensor goes and enlarher it slightly, all we are talking is a hair width.
Nearly tempted to go do and see if it could work as in theory its no different than the HPD MAF housing for $250, I think it would work with care taken and worse case if it doesn't then you were probably in the market for HPD one anyway if needed.