i just got ultimate racing high flo0ws im going to put them on today 5yr 50,000mile warranty is why i bought them

 

What are the prices of the HF cats listed in this thread?

 

around $450 from intensepower.com

 

I like the Helix HF Cats that I just installed this past weekend. Very noticeable gain, and a real aggressive exhaust note even with the stock exhaust.

You can see a video I recorded with the cats at this link:
https://my350z.com/forum/intake-exhaust/118619-video-helix-hi-flow-cats-stock-exhaust.html

 

Will all of these HF Cats pass emissions? Not California emissions, I mean just basic emissions?

Helix prints they'll pass Cali emissions, pretty impressive.

But what about Crawford and Kinetix?

 

Most will more than likely pass a sniffer, but I have no idea about a visual inspection.