GT2KDave is right, it is completely pointless to upgrade your injectors and MAF unless you go with heavy mods like:
-N/A heavy mods like heads, intake, exhaust, cams, long tube headers, etc.
Don't even buy an aftermarket MAF for your car. THE STOCK MAF IS JUST FINE WITH THE STOCK INJECTORS. The MAF companies won't say that of course. Send me the money instead. The stock GT injectors are good for up to 300 HP.