does anyone know what size a stock mass air is on a 03 GT or wear i can get a better than stock one?

 

A lightning 90mm maf is better than stock. An SCT BA3000 is even better along with the Sniper Bazooka BA3000.


BUT, why are you trying to upgrade your maf? If you don't know, these cars aren't like the 5.0's speed density or hondas where all you'll need to do is upgrade injectors & MAF's and you'll gain HP. In fact, you will not gain any HP from either of those modifications. If you change your MAF to something other than stock your car will not run without being calibrated.

 

^+1, the stock MAF is 80 mm and will properly meter up to 350+ HP--there is nothing to be gained by "upgrading" it...

Not entirely related, but here is a "back of a napkin" analysis of the MAF, the MAF screen, and various TBs...

 

put that money towards something else, the stocker is fine for anything under 340-350rwhp like said above

 

then if you need something for more than that, just get a M.A.F.ia from diablosport. They boost the output of the stock maf.