WHAT DOES 4AGE BLACKTOP FOR SALE MEAN?

Re: ITB Conversion on sixteen valve 4AGE really? maybe i must get yourself a new one particular then? at this time i get about 7.5L/100km for my rather normal ae92 SX? (approximately 450km's among fuel lights) i havn't experienced mine plugged in for more than six months considering the fact that redoing the exhaust before xmas! (snapped it off)4ag