hi first of all sorry for my english im from quebec ... yeah ok lets talk about my G .... i have a cat that is dieing i can hear noise inside of it ... soo yeah i were thinking about removiing them and installing downpipe instead of paying 1200$ for a jobber cat .. soo what do you all think about it ? does it will cause something to the engine if i do it? and if i should change it what kind should i take ? megan ? magnaflow ? i dont really know :S and do i need a gage to check the airflow or the gaz mix ??