How different would the sound be after a high flow cat is installed. Already got CAI, header, and catback system. Like, would it make change my tone to one of those weed wacker sounding mobiles or just get louder in general? or not?

 

does your cat-back system include a resonator????

 

-aem cai
-neuspeed n2 header
-greddy evo2 catback system

 

it'll make it sound more raspy. you won't notice a big change from inside the car though.