I thought I recognized those tail pipes. Those SS headers and mufflers are on two of my cars. I think their sound is approiate for Panteras. The tail pipes were re-angled for both of my cars because they have small chrome bumpers. It looks like they put a little more angle on yours, more like a 71, and it looks good.
Here is a photo of original exhaust on a 71 Pushbutton.
I should also mention that your exhaust system is high performance with large diameter tubing and improved baffling throughout the system.
