The only real enhancement I've ever seen is chrome exhaust tips that some people have put on their TB/Envoy. That's it. I think the stock exhaust is pretty good to speak of ... so, is there a need for better exhaust?
I've seen Chrome tips. However there is a company that is producing a split header true dual exhaust system for the TB / Envoy. I'll get the information and will post it back on here.
Just checked out the link and had a live chat with the company order guy, $940.00 for complete system. not bad really for Borla exhust. Need to check the piggy bank!
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