Anyone have any experience using eBay headers on y7 motor also if I delete cat and put header in place with no cat am I gonna get a cel

 

The header won't reach your B pipe without a cat between them - you'll need to buy an EX-style cat. If you run without a cat, yes, you will throw a CEL. A cheap eBay header is just that - a cheap chunk of metal with shitty welds, that'll oxidize quickly and look like *** in short order.

 

Ex style cat? What if I run no cat and just use a de fouler or whatever they called and I don't care what it looks like

 

Sure you can do that if you want.. there's no point tho on a single cam so you'd just be making noise an polluting.

 

A defouler isn't going to stretch the massive gap from the header to the B pipe...