After reading through the comments again there are not a lot of options that will look pleasing to the eye trying to cut down the noise coming out the exhaust do to the restrictions that start out of the manifold. When you add a supercharger or a twin turbo you are pushing a lot more air through the system and the restrictions will cause an increase in sound and can cause performance issues due scavenging. A 3" down pipe is needed to benefit a 3" exhaust system. This will significantly cut down on the sound. The Motordyne exhaust only becomes 3" where it meets up with the connection to the y pipe so the sound is actually magnified. I have had the pleasure of riding in a Z that had a twin SC and a Motordyne exhaust system on it. Yeah she was loud and sexy as hell. I doubt there going to any other exhaust will change anything significant because of the amount of air moving through the system. Yes, I think maybe a system like Armytrix might help to a degree but that is an expensive option that may be a fail. I would suggest having a baffle or butterfly value put in that can be manually turned on or off.
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