Re: exhaust question **need help**
The only way to make the Corsa louder is to add headers and/or deleting the cats... Unknown if the other system would allow you to bolt together. Best is to probably sell your Corsa and buy what you think sounds best vs a potentially expensive trial and error process...
Currently there is GT Haus, MRT (unknown if currently on market or still in build/testing phase), ARH, Kooks, Corsa, Magnaflow, and Borla that offer exhausts for our SRT. Outside of those you are looking at a custom build.