Is there anyone out there that sells just the header for my 03 R6?
The guy that I had purchased my bike from only has a carbon fiber wileyco slip on, I'm guessing.. The cat has been eliminated so I'm also guessing he has the midpipe. I wasn't able to find much of anything about wileyco, anyone have any suggestions? Maybe I should just look into buying a whole new full exhaust system? Should that be my "first" upgrade?

Anyone have any ideas at all??

I've never heard of wileyco. Generally it is hard to match one company'es pipes to another company's header, unless you are sticking with OE replacement stuff.

It will probably be easier just to get a new system. You can get a decent M4 for pretty cheap.