Yea thats exactly what I want to do.! I already replaced the starter in this car once and It would have been impossible if I had a permanent exhaust system. Right now I just have a temporary exhaust. I have the down pipes the two pieces of flex tube from the down pipe to the mufflers. I want to replace everything from the downpipe back eventually.
I bought the summit 2.5" header back kit with mufflers, and ordered the head pipes up from Mancini, the head pipes fit great, I did have to buy an extra 1" piece of pipe from the local parts store.
I fully welded every joint except I clamped the mufflers together.
It took me 3 evenings of cussing after work, with the car sitting on jack stands.
I tacked every joint, and took it out from under the car, and welded it all the way around.
When done it fit great, no rattles, or leaks.