k so 1st thing is i know my truck has 4 cat-converters on it, and if i do say a flowmaster american thunder cat-back, will it be a bit quieter cause i have all 4 cats on??
2nd- i put my k&n air intake on, can i delte 2 cats or will it run to lean then??

Please help me out if you can, any advice will be greatly appreciated!