Xrs header code

Now i dunno if there is a post on this forum ive looked everywhere. Well point is i got aftermarket headers and i got a code well a couple codes now i alrdy did the non fouler trick on my 2nd o2 and of course the reg code came up saying maf range is wrong and system running rich. I dnt kno the codes off the top of my head but ill get em posted. Now i tried a 2nd non fouler added on the s pipe(note both foulers are on the s pipe) now i get the same code after 500 miles or soo. After a trip to cali from vegas. Now i know the car is powerfull cuz i smashed on a caddy v8 like no prob. But gas consumption is very noticeable especially with these gas prices now would a 3rd non fouler work?