I've got 2 1/4" pipe from the cat back, 6" later I've got a Thrush glass pack. I HIGHLY RECOMEND throwing one in your piping. It'll run you 50bux which is so worth it, my Magnaflow went from low-tone clackclackclack 10k times a minute to a deep smooth tone. not sure what your riding, I hear other Civics consistantly that payed as much as you did and still makes me go UGHH as they pass by.
Thrush Glass Pack
Logo looks like woody the woodpecker

Sooner or later i'm going to get a sound clip of my car from 3k-7.4k to let people hear it since there is always someone that starts claiming i'm lame and dillusional