Hi Jaker,
We do not have tunes specifically for the 803 Porsche MAF. We have plenty of support for the 3.5" 540 and Euro M3 MAF. At this time, we do not plan to make any software for the PORSCHE MAF since for high HP applications we have our Blow Thru MAF that we want to sell. Also, getting a USED 803 MAF has the possibility of being bad. Rather than argue with customers who refuse to consider that a possibility, we would just rather stick to a sensor that we know and can quality assure more intimately for high power applications.