well after checking it out for 2 years,i finally got rid of my 4 cats and put on 2 hi flow cats with 3 inch piping from the headers through the hole system going with an x built right in the pipes going to a 3 in and 3 out 50 flowmaster what a differance in performance,and power,i had the stock system before with 2 flowmasters and 4 cats on from factory,the truck didnt perform any better and it was always with the check engine light on,no props now

 

You ran 3" true duals with highflow cats... I'm guessing you lost a LOT of lowend torque? I bet it sounds nasty tho.

 

nope i didnt lose anything,if any i gained i was never able to burn the tires before but now they will spin,and i ran true duals from the moter to one flowmaster,and it does sound good,and it idles and runs better and a lot better gas milage