Yeah, they are pritty cool, makes things sound awsome
A hotdog doesnt go over the tip, it goes inline with the centre muffler. (you need to cut a section and weld one in)
Im not sure so feel free to quote me, but i think i read somewhere that the stock headers that is on your motor is about the best flow you can get, besides i dont think there is much room to fit a aftermarket set of headers with have to move parts around.
If you want performance maybe you should be more leaning towards a chip? its less expensive than exaust upgrades and is a better place to start.
Peace, let us know whats happening