Yeah @
VENOMIZD Removing the resonator would add to the volume! I would suggest trying that, but there's a chance it might be a little too loud (depends on your taste). That small muffler isn't going to block much noise, so it'll be similar to straight pipe. Might get some in cabin drone.
About the weathering of the pipes, might want to consider a stainless cat back system to avoid that. Corsa and Volant are popular choices that have all stainless piping and muffler.
I would at very least try out removing the resonator first though and go from there.
Good Luck and congrats on your purchase!