i want your all's opinion on hi flow cats, and whether i should put them on my 03 f150. i've already got true duals, but would like to be louder. what's your guys thought on this, any of you got hi flows on a newer truck?

 

I personally think it would be a waste of money to replace perfectly working cats.

 

i've got a set of redneck engineering high flows on mine and its pretty loud