Well basically id like to make it louder and not really sure what to do. Already have berks hfcs and don't want test pipes, is there a mid pipe that'd be louder or something??

 

i have the same issue as you,
mybe get some headers too,

you can alternatively remove the resonated parts in the catback. but that might cause rasp

 

I think the headers would give it a little more, just don't think it'll be quite as loud as I would like now removing the resonated parts might be ideal, I wonder how easy it'd be to reinstall if it did create more rasp than wanted...

 

you can fab a new piece for the middle section of the exhaust, they have quite large resonators there, the piece that goes above the rear sways