Corsa Sport axle back exhaust

Maybe someone here can give me a little help/advise. I installed a Corsa Sport axle back muffler system on my 2011 C6. I like the tone so far but now I am considering getting the cat-back pipes to add to the mufflers. What kind of difference will this make with the tone of the exhaust? I visited this website. If it doesn’t change much I probably won’t bother, but if it enhances the tone it may be worth the time and effort. Any help?