You will need 2 longer hangers. The 2 hangers that are above the muffler canister are the ones needing the longer hangers. You need to lower the tailpipe down, so it won't melt your bumper. There will be one hanger you won't use, by the rear crossmember. I was able to tweek the STI canister to fit on my 05, but that is because I am a cheap illegitimate offspring and didn't want to buy hangers.
When I do this at work, usually STI chssis-based performance exhaust, we buy the longest hangers Autozone carries. I would say they are 5-6" long.
I will take a pic today and send it your way.
The tip does NOT clear the bumper completely, so you may get some damage to the paint around that part of the bumper.
tweaking the hangers is the easist way to get the tip exactly where you want. If you have a torch, heat the arms and move them. If your like me and dont have a torch, just hit the arms with a sledge or the back of an axe.