[Jim Vander Wal]

I have both the Firefly sidepipes and headers. I think my sidepipes are the 3rd set sold, 2005 vintage. I started with 2" primary headers (too big) and then switched to 1-7/8". 427w w/ AFR225 heads. I'm pleased with both the headers and sidepipes. Power is much better but can't quantify as it's been a long time and there were many other changes along the way.

The Superformance SBF headers did block the AFR ports and the port shape was significantly different but the AFR heads have large square ports.

No experience with Gas-N pipes but have spoken to them, seems like a good group. Ron at Firefly is excellent and does know how to make pipes that work.

Jim