Need some advice about my exhaust

Can someone one help me with putting cats on a BBK exhaust, It's BBK from the headers to the muffler, It's the Off road H pipe, the mufflers are 2 chamber Flowmasters, I just need to put some Catts on it to pass emissions, then I would like to take them off but I don't want to butcher my exhaust because the car sounds too sweet!
 
Can someone one help me with putting cats on a BBK exhaust, It's BBK from the headers to the muffler, It's the Off road H pipe, the mufflers are 2 chamber Flowmasters, I just need to put some Catts on it to pass emissions, then I would like to take them off but I don't want to butcher my exhaust because the car sounds too sweet!

If its a 5.0 it shouldnt have to be tested to old. Only the 96 and newer get tested.
 
Are your headers shorties? From the sound of it, you just want to put cats on it to pass emissions. Then take them off once you pass.

If they are stock length headers, you might as well put the stock H-pipe on temporarily.