ya the injen is the best intake for MAF, 2.5 RS's. Though you can buy a MAF adapter and adapt the cobb intake to it. Also, supposively, cobb is making a CAI for the MAf impreza. Might wanna check with them about that since the cobb intake is the best intake for the 2.5RS IMO. Glad to see you are doing more mods to your RS Frances.