Looking into some premium headers for my sub and I've seen these pop up in multiple searches.
Are there any other brands I should include in my search?
Are there any other brands I should include in my search?

Stan's Headers in Auburn Washington are the Shiznit!!! He uses a ball & socket collector that never leaks and the best materials available. Most flanges are 3/8 and are FLAT!
http://www.stans-headers.com/
My understanding is that he & Doug Thorley were once partners.Stan definitely took his product to the next level. I have owned both!!

Aren't all headers illegal for use in California?
Sorry! Didn't think about that!