Agreed. Leave it alone. I have not seen anyone on here who has found a huge improvement in sound from switching exhausts.
In an effort to get rid of gas pedal vibration which the dealer told me was caused by harmonic vibration from the exhaust, I went from the stock exhaust to the Corsa Sport (just bought their muffler) to the Corsa Xtreme (added the resonator delete). The x-pipe that Corsa sells as part of the resonator delete offering is what has actually taken care of nearly all of my gas pedal vibration. That said, according to Corsa, I could replace the Corsa muffler with my stock muffler without affecting the gas pedal vibration cure created by the x-pipe. This would give me an exhaust that is slightly louder than stock, but not as loud as the Corsa sport, but I can't go back. I really love the Corsa Xtreme even though it makes a fair amount of noise. The exhaust note is very deep and really sounds great. The only downside is that you hear it while cruising on the highway above 60 MPH, or under load, but I am personally okay with that given the smile it puts on my face at all other times. I won't say it sounds like a V8, but it is pretty close in my opinion. The quality of the sound with the Corsa Xtreme system is a lot different and much better than the Corsa Sport. I am 46, have a professional job, and I never would have guessed that the Corsa Xtreme is the right answer for me.