i think i have the exhaust manifolds, ypipe, and new walker muffler with dual tail pipe exits but i dont have the converter and or the pipe going back to the muffler.
your best bet is just to not waste your time with a stock setup. go on the cheaper side and go aftermarket.
get all this and your done... this is the cheapest, but will outflow your stock stuff substantially. your choice of a catback i picked the dynomax 2.5" bc its cheaper but u should look into a 3" system for even more flow.
http://www.summitracing.com/parts/HED-68470/ http://www.summitracing.com/parts/HED-17470/ http://www.summitracing.com/parts/WLK-17495/
total 446$ for a better flowing bolt on brand new aftermarket setup. Dont mess with old stock stuff... u'll regret it later. not to mention you need all the correct exhaust manifold studs etc... which always break