Do I also need a highflow cat since I have headers & dual exhaust by JBA. Today I went to a muffler shop and was told that with headers that they would the flow would junk the current cats in a few months. Will I need to put the highflow cat(s)? I was also told that there are 4 cats on this truck (2 on each side). Can anyone give advice??? Come one come all!!!

 

yes there are four cats on our truck, exept 06 ive heard they droped to two of them in 06+
High flow cats are probably worth your time and money with you set up, hell i would put high flow cats on mine even if i didnt have headers, just cuz they are better, or just get rid of them all together and have them deleted out of the PCM well the o2's deleted.
just my opinion im no expert.
-Patrick