thinking of either putting in high flow cats or just getting rid of them which is best? And if i do what do i need to do about the 02 sensors. I have an 06 fx4 5.4 with CAI, dual flowmaster and an edge, Any ideas on what i can to do for more hp other than supercharger?

 

well on a 2006 i wouldnt cut the converters off, to new of a truck for that, you can get some 94106 hi flow magnaflow converters to open your exhaust sound up a little, the converters will fit right between the sensors, as in sensor, converter, sensor

but if you cut the converters off you will just replace the converter with a piece of 2.5" pipe and your check engine light will come on unless you get MIL eliminators, your just illegal then and you cant pass inspection or emissions

 

replacing oem cats with "high flows" gains you nothing but sound.

 

i thought thats what this thread was about...

 

the OP says hes lookin for HP

 

ohhhh sry i thought that was another question

 

thanks for the info on the cats prolly just leave as is then

 

To volume it up more hi-flow cats will do the job, performance wise your two stock cats perform just as good as hi-flow cats would, The 4 cat system on the early 2005s & older restricted more sound and minimal power.