There are some good systems that are avalible for your Impala SS. Have a look at Clear Image Automotive they build systems for our cars. Try a surch on You Tube there are lots of cars that have many different exhaust systems.
I would try to find a local Impala SS club and take a ride in the cars that you like the sound of the exhaust. Look for other posts that I have replied to on the forum.
I did find this link
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