99gtstang

I do not want to void my warranty... If I get HI flow cats, will I pass emissions, will it throw the famous bank code? No tuner and no plan for one anytime soon. Currently have roush axle backs and want it a little louder

THanks for the input.....

fordplay

High flow cats should not throw a code and should not void any warranty othen than exhaust. But they also cost a lot!!!

hawkeye18

The cats on the '11+ are already remarkably high-flow. Why do you feel you need more?

Entaille

why do you say this - do you know much about the stock cats? curiosity question, do you know their cell count for their cores?..

he did mention he's just looking for more volume/sound. imo, if you replace the overaxle pipes you'll get the sound increase you are looking for. this is why I did a catback instead of an axle back.