Has anyone here ever had their stock exhaust tuner carbon up? I have a 1995 mariner 3.0 225 hp that I've put new coils on, new reeds and now a new ecu. It runs pretty good but lacks rpm on wot. It's carbed and I have pulled the carbs off and cleaned them too. Serial#og258836
24 pitch fury only getting around 52-5400 rpm at wot.