[chiefpontiac66]

Originally Posted by Rocky Rotella

Pontiac's mufflers were produced by Oldberg and were designed for a specific sound. Did your Grand Prix sound like this?

https://www.youtube.com/embed/U7l12H...feature=oembed

If so, you might consider this system from Gardner Exhaust. It's expensive, but well worth the price!

https://www.gardnerexhaust.com/exhau...aust-system-3/

After listening to all of the sound clips for the GTO and Grand Prix on Gardner Exhaust's website, and after a couple of conversations with Eric Gardner, I learned a lot about what they do to provide a quality product that will stay looking nice for a long time. As a result, I ordered their concourse system with stock mufflers. Thank you Rocky for the recommendation. There is a 71 GTO in the sound clips with stock mufflers that sounds as close to my parents' car as I can remember. Maybe a little bit louder, but still the right tone. Eric was a real pleasure to deal with and told me that my car will have the same mufflers as that 71 GTO. Although it's expensive and there is a wait time, I believe I will have no regrets. I will update this thread once I receive the system, and it's installed.