Guys, it is impossible to produce a different sound due to the very special construction of the exhaust manifolds/engine setup. You can get it louder but thats it. This is a huge problem for tuners. I heard at least half a dozen aftermarket exhaust systems but none of them sounded different, just louder. Not really helpful I'm afraid.
This is one reason I don't get that hype on the internet when people show off a new video with an aftermarket exhaust. It is IMPOSSIBLE to create a different sound, believe it or not. Even M GmbH is working on improvements, playing around with the exhaust flap control timing but it doesn't really seem to improve things.
Save your money...unless you want to sound like a tuned rice burner.