Header for b16 da9

What kind of header can i get that will bolt up to a b16a with outs mods, I have a jasma ss 4-2-1 header sitting in my garage that is like 10 inches to short to reach the cat and no exhaust shop will even mess with it cuz its not CARB legal. I think I have the ls exhaust manifold on right now, if you look under my car it bolts directly to the cat with no welding or any extending, im sure if its an ls exhaust manifold that I am loosing some power. Help me out.

O yea another thing is I only have 1 02 sesnor, so does that mean i could just get a nice ls header and bolt it up?