Going from mids to Lt's with a pic
 

My questions are, is there that much of a difference in these 2 styles and what are my old header make. Can't find a # or manufacturer?

Those look like MAC midlengths. They are a decent header. Long tubes will make more tq in the midrange. Is it worth switching out? If you are doing the labor yourlself, then its a little better. If you have to pay to get it done, it's not as good of a deal, because those headers still perform pretty good. You will gain more tq though, so most people will say yes.

The header on top IS a Mac mid, the 1 underneath looks like a longtube, but don't know which brand:)

I guess I forgot to say the lt's are pace setter. It's nice to know what my old mids are though, so thanks. I'm doing the change over myself. I was hoping for that big horse big torch gain but it ain'tt lookin that way.