Here's my JVT Ebay (SS knock-off) headers with SuperSprint Race mufflers. Skip to 1:35, 2:55, and 4:56 for the 3 different runs. I chose SS because of how it sounds up high. I wanted as close to the F1 sound as possible with the S54 motor
Down low, the SS setup just does what any other brand of muffler does: drone a bit, and growls. My opinion is that the other brands growl and sound better down low, but none sound as clean as the SS up high. I don't like rasp, and after listening to a lot of YouTube videos, I narrowed my selection down to the SS as the only one that didn't rasp up high. My friend's satisfaction with his E46 M3 was also another factor that came into play when I made my decision.