I had the same problem as the rest of you guys when it came to buying the tubing. But......... when all else fails JC Whitney
to the rescue. I bought enough 90*, 45*, and 180* bends to to the entire dual system for about $100. I also bought a crossover pipe kit from Summit. I think it was about $40.
Whatever straight pipe I need I'll just pick up from a local muffler shop but I don't expect to spend over $200 total for the entire system including the turbo mufflers. (I bought a couple Hemi Challenger square chrome exhaust tips at a swap meet last year and I'm not counting what they cost me