Local shops usually do a very nice job. I had mine done 8 years ago when I lived in CA at a small muffler shop. I went with
2-5/8" pipe front to back with dual 40 series FlowMasters and an "H" pipe. I have since added LB manifolds and tail pipe splitters. Looks good, fits good and sounds great. The only negative to a local shop is that most often they can not do a mandrel bend. Other than that they typically do a great job and usually a great price... JMO