Has anyone with sport cats found a way to get the CEL to stay off...O2 spacer or coding out secondary O2 sensor? I have a CEL now and it doesn't bother me, but ideally when I sell the car I'd like to have the CEL off without having to put the stock cats back on. I'd rather not pay $1k for a Velocity tune and potentially have the warranty affected.

 

If you are not gonna tune it out, your best option is to put the stock cats back in. As I don't believe there is another way. Those o2 foolers or mini cats might work, but I've heard it's a hit or miss with them.