Heck... I have a full system minus piping that I'm trying to sell that was going on my Honda. It's all 2.5" stuff in stainless steel... high flow cat, 22" long Magnaflow Resonator, and a Greddy style muffler (full size with lots of packing, but straight through).
Should sound pretty good with the long resonator and retaining the cat. Have a shop weld up some piping for you and bam, there you go!