Precisely why I went the Legendex route. It's full 3" SS, and also hi-temp coated tip to tail. Fit was great. Comes with every piece of hardware and gaskets, except the exhaust hangers and the four nuts and gasket at the dump flange.
My advice would be to go ahead and buy the 3x exhaust hangers ahead of time. The studs will snap. My truck has 210k KM's, and out of 12 nuts, 10 of them snapped clean. I bought them locally from Toyota (17567-17010 qty:3 - they don't come with nuts, but I found enough in my nut & bolt bucket). I cut my old exhaust off with a sawzall, and had the whole job done in four hours using my buddy's lift.
Ben@superiorengineering.com.au if you want to get a quote.