Exhaust changeover woes...

Well, for some unfortunate reason I decided to install my Ranger header today. When I went to break the bolts on the exhaust manifold, wow, they all came right off...this started off too easy. So I get to the part where I install my header/direct-fit cat-pipe setup (which I dry-fit first, everthing seemed to clear) I find it wont fit! So now I have to scrap my sidepipe plan and have a shop build me an exhaust from the header back! Booo!
Does anyone have any suggestions as to how I should ask them to set it up, I mean I know I just want one hi-flo cat and one muffler, I think they have Dynomax or Magnaflow at the shop I go to.
Help?