The best way to get the tubing done, is to find a low-buck exhaust shop, and have them bend you some 3" pipe the way you'll want it. The shop I go to said they only charge $20/hour for that kinda labor, and they'll have it done within 10 minutes. Prolly because it's such easy work, I'm thinking.... An easy way to get the bends right, is to go buy some cheap-ass flex exhaust pipe $15-20, and bend it the way you want it, and pull it out intact, so they can copy your bends... If you keep it in good, clean shape, you can prolly return it when you're done, too... But, that's just my $.02... Oh, you can also paint the tubing when it's finished, to make it look extra-purty.