2018 F150 Coyote. Thoughts on high flow cats or just save the money and put on a cat back exhaust. Looking for better sound but better performance would be great to. Just don’t want to have to take out a 2cd mortgage for high flow cats. Not sure who even make them? Any ideas?

 

Unless your high hp (600+) and on the verge of blowing your factory cats I'd leave them on. If you want sound play with your catback. If you want performance there's better alternatives.

 

Better options meaning... tuners?

 

custom tune will be the best bang for your buck, yes.